New Mexico Construction Industries Division • PSI GS-21 Roofing • 75 Questions • 200 Minutes • 75% Passing • Open Book • 2021 Building Codes • NRCA Roofing Manuals
Getting ready for the New Mexico Roofing Contractor GS-21 exam? This guide explains the current PSI exam format, licensing experience, roofing subjects, approved reference books, Business and Law requirements, study strategies, and related roofing courses and books from Contractor Exam Preps.
A roof has one major job: keep weather outside where it belongs.
Unfortunately, wind, rain, hail, snow, heat, and time do not always cooperate.
Roofing contractors install and repair systems that protect buildings from these conditions.
That work involves more than shingles and a nail gun.
Roofing professionals must understand underlayment, roof deck preparation, waterproofing, flashing, fasteners, drainage, insulation, roof geometry, and safety.
They also need to know how to estimate materials and interpret building plans.
And anyone working high above the ground should understand fall protection before they understand which ladder gets them up there!
New Mexico regulates roofing contractors through a specialized construction license classification.
That classification is GS-21 Roofing.
Qualifying parties must meet the applicable experience requirements and pass the trade examination.
They must also satisfy the state's Business and Law requirement through the exam or an approved course.
GS-21 is the state's general construction specialty classification for roofing.
Its scope includes installing, altering, and repairing roof systems on new or existing roof decks.
The goal is to create a weatherproof or waterproof protective membrane.
The classification includes work with common roofing materials such as asphalt, pitch, tar, sealants, felt, shakes, shingles, tile, slate, and approved roofing products.
It also includes related preparation and certain sheet metal components.
Examples include flashing, gutters, rainwater leaders, downspouts, and other roof-related metal work.
The classification does not automatically authorize unrelated structural or construction activities.
Contractors should review the complete wording of NMAC 14.6.6.9 before choosing a license.
The New Mexico Construction Industries Division, commonly called CID, regulates roofing contracting.
CID operates under the New Mexico Regulation and Licensing Department.
PSI performs examination approval and testing functions for contractor licensing.
Licenses are issued to qualifying business entities that are owned by or employ an approved qualifying party.
The qualifying party is the person whose trade experience and examinations establish the required technical qualification.
The official PSI Candidate Information Bulletin updated April 3, 2026 lists 75 questions for the GS-21 Roofing trade examination.
Candidates receive 200 minutes, or three hours and twenty minutes.
The examination requires a 75% passing score, listed by PSI as 57 points.
This is the current official format.
Some older or uncorrected roofing course descriptions list 60 questions and 150 minutes.
Those figures do not match the April 2026 PSI bulletin.
Use the official 75-question, 200-minute format when preparing.
Yes. The GS-21 Roofing examination is open book.
That does not mean every roofing book can enter the testing center.
PSI lists specific approved references.
Candidates must supply their own approved books.
Reference materials must be bound.
They may be highlighted, underlined, and indexed before the examination.
Permanent tabs are allowed.
Temporary tabs, loose papers, and handwritten notes are not allowed.
Writing in reference books during the examination is prohibited.
Study with the same approved books before test day so you know where information appears.
The current PSI GS-21 examination has five official subject areas.
These categories total 75 questions.
The largest category is Steep and Low Slope Roofing.
It represents more than 45% of the trade examination.
That makes roofing system installation and performance a major study priority.
Steep-slope roofs are commonly found on residential buildings and other structures with sloped roof designs.
Typical materials include asphalt shingles, wood shakes, wood shingles, slate, and roof tile.
Study roof deck conditions, underlayment, roof covering requirements, fasteners, flashing, penetrations, and ventilation.
Learn how roof slope affects material selection.
Understand why some roof coverings require special underlayment or installation details.
Review manufacturer instructions and applicable code requirements.
Practice locating details in the NRCA Roofing Manual for Steep-Slope Roof Systems.
Low-slope roofing is common in commercial buildings and certain residential designs.
Roof membranes help prevent water from entering the building.
Study built-up roofing, modified bitumen, and single-ply membrane systems.
Review attachment methods, seams, terminations, insulation, flashing, and roof drainage.
Learn the importance of proper substrate preparation.
Understand how ponding water and poor drainage can damage a system.
The 2023 NRCA Roofing Manual for Membrane Roofing Systems is an approved examination reference.
Estimating and Plan Reading accounts for thirteen questions.
Roofing contractors need to calculate roof areas and material quantities.
Study square footage, roof slope, roof geometry, waste factors, material takeoffs, and labor quantities.
Review construction plans and roofing specifications.
Practice reading dimensions and identifying roof details.
Understand that one roofing square equals 100 square feet.
Learn how valleys, hips, ridges, dormers, and penetrations can affect estimates.
Review Roofing Construction and Estimating by Daniel Atcheson.
Surface Preparation and Planning contains ten questions.
A roof system needs a suitable surface before new materials are installed.
Study roof deck conditions, moisture, substrate compatibility, damage assessment, and preparation requirements.
Understand why rotten or damaged decking should not be ignored.
Review proper planning for reroofing projects.
Study existing roof coverings, tear-off procedures, and material compatibility.
Learn how roof preparation affects performance and long-term durability.
Roofing Components contains eleven questions.
Roof assemblies include many components that work together.
These may include roof coverings, underlayment, flashing, fasteners, insulation, drip edges, valleys, vents, and drainage products.
Study each component's function.
Learn why flashing is critical around chimneys, skylights, walls, and roof penetrations.
Review roof drainage and water-shedding details.
Understand how installation mistakes can lead to leaks even when the primary roofing material is correctly selected.
Safety includes seven GS-21 exam questions.
Roofing involves work at heights, ladders, scaffolding, tools, and changing weather conditions.
Study OSHA 29 CFR Part 1926.
Review fall protection, guardrails, personal fall arrest systems, ladder use, scaffolds, and jobsite hazard awareness.
Study safe handling and storage of materials.
Understand the risks of overhead work, falling objects, heat stress, and unstable walking surfaces.
Construction safety is more than an exam topic.
It is essential to getting workers home safely.
The GS-21 approved references include both state and international building codes.
These are:
Study the roof-related chapters and provisions.
Review roof coverings, reroofing, underlayment, fire classifications, flashing, and weather protection.
Be aware that New Mexico-specific requirements may modify national code provisions.
Roofing Construction and Estimating by Daniel Atcheson is an approved GS-21 reference.
The current bulletin lists the 2022 printing.
Its subjects include roof sheathing, underlayment, shingles, shakes, tile, slate, metal roofing, built-up systems, insulation, waterproofing, coatings, repairs, and estimating.
Use this book to review both practical installation methods and estimating calculations.
Before buying, confirm the edition or printing matches the current PSI reference list.
The current PSI bulletin specifies the 2025 NRCA Roofing Manual: Steep Slope Roof Systems.
This manual supports study of steep roofing materials, installation methods, details, flashing, and roof assembly practices.
Some older store product listings describe earlier editions.
Verify the actual shipped or rented edition.
The approved membrane reference is the 2023 NRCA Roofing Manual: Membrane Roofing Systems.
Study membrane materials, roof insulation, attachment methods, seams, flashing, drainage, and repair practices.
Membrane roofing is especially important for commercial and low-slope work.
The exam references include the Concrete and Clay Tile Installation Manual, 2015.
Study roof tile types, underlayment, fastening, flashing, roof layout, and installation details.
Review how tile systems differ from asphalt shingle and membrane systems.
Tile roofing is a familiar sight in many parts of the Southwest, including New Mexico.
The currently published New Mexico classification rule specifies two years of foreman-level practical or related trade experience for GS-21 Roofing.
Applicants must document qualifying experience through the proper affidavits.
The state's qualifying-party application process generally requires experience earned within the ten years preceding the application.
Applicants should verify the currently effective rule before submitting paperwork, as proposed changes are not automatically adopted requirements.
The qualifying party is responsible for demonstrating technical qualification for a contractor classification.
To start, submit the qualifying-party application and work experience affidavit.
PSI handles approval processing for CID.
The current published qualifying-party application fee is $36.
After approval, applicants may schedule the required trade examination.
They must also meet the Business and Law requirement.
Passing examinations is not the same as receiving the actual business license.
New Mexico contractor applicants must generally pass the Business and Law examination or complete an approved Business and Law course.
The official PSI Business and Law examination contains 50 questions.
Candidates have 130 minutes.
The passing requirement is 75%, listed as 38 points.
The exam covers licensing, estimating, business organization, finance, taxes, labor, project management, contracts, risk, and safety.
Its approved references include the NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition, along with specified New Mexico laws and regulations.
Contractor Exam Preps sells the New Mexico Business and Law Complete Pass Package.
The current PSI bulletin lists a trade examination fee of $68.88 for GS-21 Roofing.
The Business and Law exam fee is also $68.88.
Together, the two examination fees total $137.76.
The qualifying-party application fee is a separate $36.
The business license application requires another $36 processing fee plus the applicable license fees.
Check current payment instructions before applying.
Contractor businesses must meet financial and administrative requirements.
New Mexico requires a $10,000 contractor license bond under its current licensing regulations.
The bond must remain valid for the applicable licensing period.
Businesses must also complete appropriate tax and business registrations.
Workers' compensation requirements may apply to licensed entities.
Contractor licenses are issued for three-year periods.
Renewal requires continued compliance with bond and license requirements.
The current New Mexico PSI bulletin states that passing examination scores are valid for one year.
Contractor candidates taking the examination route must complete the trade and Business and Law requirements within the applicable one-year period.
The bulletin also requires candidates to test within six months after their eligibility approval.
Do not complete one examination and forget to finish the rest of the licensing process.
Contractor Exam Preps offers an actual New Mexico GS-21 Roofing Online Exam Prep Course.
The store also offers New Mexico GS-21 Live Virtual and Self-Study Training.
For candidates who need reference books and course access, the New Mexico GS-21 Roofing Books and Courses Rental Package includes roofing, safety, code, and business-law materials.
The store separately sells Roofing Construction and Estimating.
It also carries NRCA Roofing Manual Book Sets.
Before buying or renting books for the examination, compare each edition with PSI's April 2026 approved reference list.
Start with the five official exam subjects.
Focus the most study time on Steep and Low Slope Roofing because it accounts for 34 of the 75 questions.
Next review estimating and plan reading, roofing components, surface preparation, and safety.
Study all the approved books regularly.
Practice finding code sections and roofing details.
Complete roof-area and material-estimating exercises.
Review OSHA requirements and safe roofing practices.
Include Business and Law preparation in your schedule.
Finally, practice answering 75 questions within 200 minutes.
With steady preparation and the correct references, the GS-21 Roofing examination becomes a much more manageable project.
Important New Mexico GS-21 Roofing Update: The April 3, 2026 official PSI Candidate Information Bulletin lists 75 questions, 200 minutes, and 75% passing, shown as 57 points, for the GS-21 Roofing examination. The five subjects are Estimating and Plan Reading (13 questions), Surface Preparation and Planning (10), Steep and Low Slope Roofing (34), Roofing Components (11), and Safety (7). Some third-party and store product descriptions still say 60 questions and 150 minutes. The current PSI bulletin controls. Approved reference updates include the 2025 NRCA Steep Slope Roofing Manual and 2023 NRCA Membrane Roofing Manual. New Mexico's Business and Law examination has 50 questions, 130 minutes, and 75% passing, or 38 points. Business and Law may alternatively be satisfied through an approved course where permitted. Verify current exam details and book editions through PSI before testing.
GS-21 Roofing is a specialty construction classification regulated by the New Mexico Construction Industries Division.
It authorizes roofing work within the scope stated by New Mexico's classification rules.
The work can include installing, altering, or repairing roof systems on new or existing roof decks.
It covers weatherproofing, waterproofing, underlayment, roof coverings, flashing, drainage, and related roof components.
It also includes certain incidental sheet metal work connected to roofing.
The currently published classification requires two years of foreman-level practical or related roofing trade experience.
Official classification: GS-21 Roofing.
Regulator: New Mexico Construction Industries Division.
Rule: NMAC 14.6.6.9.
Experience: Two years of foreman-level practical or related trade experience under the current published classification.
Trade exam: PSI GS-21 Roofing.
Business qualification: PSI Business and Law examination or approved course.
| Requirement | Current New Mexico Information | Preparation |
|---|---|---|
| State | New Mexico | Review CID rules. |
| Classification | GS-21 Roofing | Confirm appropriate work scope. |
| Regulatory Agency | Construction Industries Division | Follow RLD licensing process. |
| Qualification | Qualifying Party | Document appropriate experience. |
| Experience | Two Years | Foreman-level practical or related work. |
| Experience Window | Previous Ten Years | Prepare affidavits. |
| QP Application Fee | $36 | Submit to PSI. |
| Trade Examination | GS-21 Roofing | PSI approval required. |
| Trade Questions | 75 | Follow April 2026 bulletin. |
| Trade Duration | 200 Minutes | Use timed practice. |
| Trade Passing | 75%, 57 Points | Target above minimum. |
| Trade Exam Fee | $68.88 | Published PSI fee. |
| Business and Law | Exam or Approved Course | Complete applicable requirement. |
| Business Exam Questions | 50 | Business, contracts, and law. |
| Business Exam Duration | 130 Minutes | Practice timed review. |
| Business Exam Passing | 75%, 38 Points | Learn business subjects. |
| Business Exam Fee | $68.88 | When choosing exam pathway. |
| Combined PSI Exam Fees | $137.76 | Trade plus business exam. |
| Exam Eligibility | Six Months | Test after approval. |
| Passing Score Validity | One Year | Complete licensing promptly. |
| Exam Type | Open Book | Use approved references. |
| References | Candidate Supplied | Bring bound approved books. |
| OSHA | 29 CFR Part 1926 | Construction safety. |
| New Mexico Commercial Code | 2021 | NMAC 14.7.2. |
| New Mexico Residential Code | 2021 | NMAC 14.7.3. |
| International Building Code | 2021 | Approved trade reference. |
| International Residential Code | 2021 | Approved trade reference. |
| Roofing Construction and Estimating | 2022 | Daniel Atcheson. |
| NRCA Steep-Slope Manual | 2025 | Check exact edition. |
| NRCA Membrane Manual | 2023 | Check exact edition. |
| Tile Installation Manual | 2015 | Concrete and clay tile. |
| Business NASCLA | Basic 14th Edition | Approved Business and Law book. |
| License Bond | $10,000 | Maintain proper surety bond. |
| Company Application Processing | $36 | Plus applicable licensing fees. |
| License Period | Three Years | Renew on time. |
| Tax Registration | Required Where Applicable | Provide state registration. |
| Workers Compensation | Applicable State Requirements | Confirm coverage obligations. |
| Detail | Category | Official Information |
|---|---|---|
| Classification | License | GS-21 Roofing |
| Regulator | License | New Mexico CID |
| Exam Provider | Testing | PSI |
| Bulletin Date | Testing | April 3, 2026 |
| Trade Questions | Testing | 75 |
| Trade Time | Testing | 200 Minutes |
| Trade Passing | Scoring | 75%, 57 Points |
| Business Questions | Testing | 50 |
| Business Time | Testing | 130 Minutes |
| Business Passing | Scoring | 75%, 38 Points |
| Business Alternative | Qualification | Approved Business and Law Course |
| Trade Format | References | Open Book |
| Business Format | References | Open Book |
| Estimating and Plan Reading | Trade | 13 Questions |
| Surface Preparation and Planning | Trade | 10 Questions |
| Steep and Low Slope Roofing | Trade | 34 Questions |
| Roofing Components | Trade | 11 Questions |
| Safety | Trade | 7 Questions |
| Commercial Code | References | 2021 New Mexico |
| Residential Code | References | 2021 New Mexico |
| IBC | References | 2021 |
| IRC | References | 2021 |
| OSHA | References | 29 CFR Part 1926 |
| Estimating Book | References | Daniel Atcheson, 2022 |
| Steep NRCA Manual | References | 2025 |
| Membrane NRCA Manual | References | 2023 |
| Tile Manual | References | 2015 |
| Business NASCLA | References | Basic 14th Edition |
| Business Licensing | Business | 8 Questions |
| Business and Finance | Business | 8 Questions |
| Contracts | Business | 8 Questions |
| Estimating and Bidding | Business | 5 Questions |
| Tax Laws | Business | 5 Questions |
| Project Management and Liens | Business | 5 Questions |
| Labor Laws | Business | 4 Questions |
| Risk Management | Business | 4 Questions |
| Environmental and Safety | Business | 3 Questions |
| Trade Exam Fee | Fees | $68.88 |
| Business Exam Fee | Fees | $68.88 |
| Qualifying Party Application | Fees | $36 |
Official GS-21 trade format: 75 questions, 200 minutes, 75% passing.
Business examination: 50 questions, 130 minutes, 75% passing.
Exam-specific references: See the April 2026 PSI approved book list.
Alternative Business and Law route: Approved course where accepted by CID.
Study roofing plans, dimensions, slopes, roof geometry, material takeoffs, quantities, labor estimates, and specifications.
Practice converting dimensions to roof areas.
Review estimating methods for shingles, underlayment, tile, and membrane materials.
Understand the meaning of roofing squares and waste factors.
Study substrate preparation, existing roof conditions, deck inspections, moisture, reroofing plans, repair methods, and material compatibility.
Understand how work sequencing and preparation can affect the roofing system.
Review applicable roof deck conditions and surface requirements.
This is the largest official category.
Study asphalt shingles, shakes, tile, slate, steep-slope details, built-up roofing, modified bitumen, single-ply membranes, insulation, roof assembly installation, waterproofing, and repair.
Review NRCA technical manuals and applicable building code provisions.
Study flashing, roof penetrations, edge metal, fasteners, insulation, underlayment, ventilation, gutters, drainage, valleys, ridges, and roof accessories.
Learn the purpose and common installation concerns of each component.
Study OSHA fall protection, ladders, scaffolding, personal protective equipment, overhead hazards, weather conditions, material handling, and worksite planning.
Review OSHA 29 CFR Part 1926.
Total: 75 questions.
Largest category: Steep and Low Slope Roofing, 34 questions.
Time: 200 minutes.
Passing: 75%, listed as 57 points.
Start by reading the April 2026 PSI Candidate Information Bulletin.
Write down the five official trade examination subjects.
Build your schedule around those subjects.
Study Steep and Low Slope Roofing most frequently because it accounts for 34 questions.
Review the 2025 NRCA Steep-Slope Manual and the 2023 NRCA Membrane Roofing Manual.
Study estimating, plan reading, and material calculations.
Review roof preparation, roofing components, and safety.
Practice using the 2021 building codes and New Mexico code provisions.
Learn which reference contains each major roofing topic.
Use permanent tabs and approved highlighting where permitted.
Complete practice tests using the actual 75-question, 200-minute format.
For structured lessons, use the New Mexico GS-21 Roofing Online Course.
For books and guided preparation together, review the GS-21 Roofing Books and Courses Rental Package.
Study priority: Roofing systems, estimating, planning, components, and safety.
Reference priority: Exact current PSI editions.
Business priority: Complete Business and Law exam or approved course.
Practice priority: Timed 75-question tests.
This diagram shows the main layers and components of a simplified steep-slope roofing assembly.
Simplified educational diagram. Actual roof assemblies must comply with the applicable code, manufacturer instructions, roof design, and approved construction details.
Review NMAC 14.6.6.9 and make sure the work you want to perform fits the roofing license scope.
Gather proof of the required two years of foreman-level practical or related trade experience under the currently published rule.
Complete the PSI application and work experience affidavits, including required notarizations and processing fee.
Wait for the qualifying-party approval notice before scheduling with PSI.
Gather the approved OSHA, code, estimating, NRCA, and tile manuals and practice using them.
Complete the official 75-question, 200-minute PSI examination and meet the 75% passing requirement.
Pass the 50-question PSI Business and Law exam or complete a state-approved alternative course.
Provide the required business application, qualifying-party records, $10,000 bond, tax registration, insurance information, and fees.
These percentages are based on the five official categories in PSI's 75-question GS-21 Roofing examination.
Official total: 75 questions.
Largest subject: Steep and Low Slope Roofing, 34 questions.
Passing: 75%, with PSI listing 57 points.
Time: 200 minutes.
Percentages: Rounded for display.
| Reference Book | Approved Edition | Exam Use |
|---|---|---|
| Code of Federal Regulations, OSHA 29 CFR Part 1926 | Latest Available Amendments | Approved Roofing Trade Reference. |
| PSI OSHA 29 CFR Part 1926 Selections | Latest Available Amendments | Alternative to full OSHA publication. |
| New Mexico Commercial Building Code, NMAC 14.7.2 | 2021 | Approved State Code. |
| New Mexico Residential Building Code, NMAC 14.7.3 | 2021 | Approved State Code. |
| International Building Code | 2021 | Approved Building Code. |
| International Residential Code | 2021 | Approved Residential Code. |
| Roofing Construction and Estimating, Daniel Atcheson | 2022 | Approved Roofing and Estimating Reference. |
| NRCA Roofing Manual: Steep Slope Roof Systems | 2025 | Approved Steep-Slope Roofing Manual. |
| NRCA Roofing Manual: Membrane Roofing Systems | 2023 | Approved Membrane Roofing Manual. |
| Concrete and Clay Tile Installation Manual | 2015 | Approved Tile Roofing Manual. |
| NASCLA Contractors Guide to Business, Law and Project Management | Basic 14th Edition | Business and Law Exam Reference. |
| New Mexico Construction Industries Licensing Act | NMSA Chapter 60, Article 13 | Business and Law State Reference. |
| New Mexico Contractor's License Requirement | NMAC Title 14, Chapter 6, Part 3 | Business and Law State Reference. |
| Older NRCA Steep-Slope Manual | Earlier Than 2025 | Confirm current approval before bringing. |
| Older Roofing Prep Course Printout | 60 Questions, 150 Minutes | Outdated Format, Not the Current PSI Blueprint. |
Exam books: Candidate-provided and bound.
Book preparation: Prior highlighting, underlining, and permanent indexing permitted.
Prohibited: Handwritten notes, loose papers, temporary tabs, and writing during the exam.
Edition check: Always compare store book sets with the current PSI bulletin.
The GS-21 examination allows approved reference books.
But candidates still need to understand roofing terms, safety rules, construction details, and estimating methods.
Learn which book covers each topic.
Practice finding the answer quickly using tables of contents, indexes, and section headings.
Become familiar with the 2021 IBC and IRC.
Practice roof geometry and estimating calculations.
Review the NRCA manuals repeatedly.
Follow PSI's permanent-tab rules.
GS-21 Roofing covers installing, altering, and repairing roof systems under New Mexico's classification rules.
The work may involve new or existing roof decks.
Approved materials may include shingles, shakes, tile, slate, asphalt-based systems, and other roofing products.
Roof waterproofing, weather protection, coatings, flashing, and related preparation fall within the defined scope.
Incidental sheet metal roof work, gutters, rainwater leaders, and downspouts may also be included.
Structural framing work outside the permitted roofing scope may require another classification.
Contractors should check applicable permits, building codes, and project-specific requirements.
Classification: GS-21 Roofing.
Work: Roof installation, alteration, repair, and weather protection.
Materials: Approved steep-slope, low-slope, and waterproofing systems.
Related work: Certain flashing, gutters, roof drainage, and incidental sheet metal.
Limit: Stay within the legal roofing classification and applicable permits.
| Classification | Purpose | Important Difference |
|---|---|---|
| GS-21 Roofing | Specialty roofing contracting. | Roofing installation, alteration, and repair. |
| GS-21-A Spray Polyurethane Foam | Specialized SPF roofing work. | Separate specialized classification and applicable certification. |
| GB-2 Residential Building | Residential building contracting. | Broader residential building scope. |
| GB-98 General Building | General building contracting. | Different scope and trade examinations. |
| GS-13 Framing | Framing and related construction. | Structural framing is not automatically included in GS-21. |
| New Mexico Qualifying Party | Demonstrates individual technical qualifications. | Supports a business license, not the same as business license. |
| Business and Law | Contractor licensing and administration. | Separate exam or approved course requirement. |
| NASCLA Commercial Building | Broader general building trade exam. | Not automatically a replacement for the GS-21 Roofing trade examination. |
75 Questions • 200 Minutes • 75% Passing
50 Questions • 130 Minutes • 75% Passing
Qualifying Party • $10,000 Bond • Three-Year License
The New Mexico GS-21 Roofing examination can be challenging because it covers both technical roofing knowledge and reference-based questions.
It contains 75 questions.
Candidates have 200 minutes.
That is an average of approximately two minutes and forty seconds per question.
The largest category is Steep and Low Slope Roofing.
Its 34 questions require candidates to understand several different roofing systems.
Someone who has installed asphalt shingles for years may still need extra study time for membrane roofing.
A commercial membrane roofer may need more time reviewing concrete and clay tile details.
The exam also covers estimating, planning, components, and OSHA safety.
Open-book testing helps, but candidates must know where to look.
Searching through an unfamiliar manual under time pressure is not a great strategy.
Practice is what turns a large reference library into a useful tool.
These products are listed on ContractorExamPreps.com and directly relate to New Mexico GS-21 Roofing preparation.
Product descriptions should be checked against the latest PSI bulletin, especially for current question counts and reference editions.
Roofing References • Codebooks • Business Law • Course Access
Best for: Candidates wanting a coordinated set of roofing and business references with organized course support.
Important: This is a book rental package. Check deposit, return requirements, current price, and exact manual editions before ordering. The current PSI list specifies the 2025 NRCA Steep-Slope Manual, 2023 NRCA Membrane Manual, and 2022 Roofing Construction and Estimating.
Online Study • Roofing Systems • OSHA • Building Codes
Best for: Candidates who already have reference books and want flexible online roofing preparation.
Important: Some store text still describes an older 60-question test. Use the April 2026 PSI format of 75 questions, 200 minutes, and 75% passing when practicing.
Live Instruction • Self Study • Roofing Reference Review
Best for: Candidates who want guided preparation and the option to review material independently.
Important: Confirm class schedules, current availability, and whether books must be purchased or rented separately.
Roofing-specific: All three products target New Mexico GS-21.
For estimating: The store also sells Roofing Construction and Estimating separately.
For Business and Law: The New Mexico Business and Law Complete Pass Package is a separate option.
Before buying: Verify current PSI format and approved reference editions.
Actual New Mexico roofing exam prep image hosted on ContractorExamPreps.com.
The artwork represents the store's New Mexico GS-21 Roofing book rental program. It is an educational product image, not a government-issued roofing contractor license.
GS-21 Roofing • PSI Testing • New Mexico CID • Roofing Construction • Open-Book References • Business and Law
New Mexico GS-21 Roofing Licensing
GS-21 Roofing is the New Mexico specialty contractor classification for installing, altering, and repairing roofing systems within the scope established by CID.
The Construction Industries Division of the New Mexico Regulation and Licensing Department regulates GS-21 roofing contracting.
The currently published GS-21 classification rule requires two years of foreman-level practical or related trade experience. Applicants should check for any newly effective amendments before applying.
A qualifying party is the individual who meets the required experience and examination qualifications for the licensed contractor business.
No. Passing the examination is only one part of the process. The business must also satisfy the applicable application, bonding, registration, and administrative requirements.
GS-21 Roofing Examination Questions
The April 3, 2026 official PSI bulletin lists 75 questions.
The current PSI time limit is 200 minutes, or three hours and twenty minutes.
PSI requires 75% passing and lists 57 points as the minimum passing requirement for the 75-question exam.
Some product descriptions have not been updated to match the April 2026 PSI bulletin. The current official GS-21 trade format is 75 questions and 200 minutes.
Yes. PSI permits approved bound references, subject to its restrictions on book markings, tabs, and loose papers.
PSI permits a silent, nonprinting, nonprogrammable calculator under the published examination rules.
Roofing Trade Topics
Steep and Low Slope Roofing is the largest subject, with 34 of 75 questions.
Estimating and Plan Reading accounts for 13 questions.
Yes. Steep and Low Slope Roofing includes membrane roofing concepts and technical installation practices. The 2023 NRCA Membrane Roofing Manual is an approved reference.
Tile roofing is part of relevant roofing system knowledge, and the Concrete and Clay Tile Installation Manual, 2015, is an approved reference.
Yes. Flashing, roof penetrations, water barriers, membrane details, and roof drainage are important roofing components and installation subjects.
Yes. Safety accounts for seven questions, and OSHA 29 CFR Part 1926 is an approved reference.
Approved Roofing Books
The current PSI bulletin specifies the 2021 International Building Code.
The current reference list specifies the 2021 International Residential Code.
PSI lists the 2025 NRCA Roofing Manual: Steep Slope Roof Systems.
The approved edition is the 2023 NRCA Roofing Manual: Membrane Roofing Systems.
The bulletin lists Roofing Construction and Estimating by Daniel Atcheson, 2022.
Yes. Approved bound references may be highlighted, underlined, and indexed before testing. Permanent tabs are allowed. Handwritten notes, temporary tabs, and loose attachments are prohibited.
Business and Law Requirements
Yes. New Mexico generally requires contractors to pass Business and Law or complete a state-approved Business and Law course.
The exam contains 50 questions, allows 130 minutes, and requires 75% passing, listed as 38 points.
Yes. New Mexico permits an approved Business and Law course as an alternative to its Business and Law examination, subject to current CID requirements.
The April 2026 PSI bulletin lists NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition.
License Fees, Bonding, and Applications
The April 2026 PSI bulletin lists a $68.88 fee for the GS-21 Roofing trade examination.
New Mexico CID currently lists a $36 qualifying-party application processing fee.
Yes. New Mexico's contractor licensing regulations require a $10,000 surety bond for qualifying licensed businesses.
New Mexico contractor licenses are issued for three-year periods. Contractors must satisfy renewal and bond requirements.
The current PSI bulletin states that passing scores are valid for one year from the examination date.
Contractor Exam Preps Products
Yes. Contractor Exam Preps sells a New Mexico GS-21 Roofing online course and a separate live virtual plus self-study option.
Yes. The New Mexico GS-21 Roofing Books and Courses Rental Package provides roofing, building code, safety, tile, estimating, and business-law resources with course access.
Yes. Contractor Exam Preps sells Roofing Construction and Estimating by Daniel Atcheson.
Yes. The store lists NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition, and related tab options.
No. Preparation products support study but do not guarantee an examination result or license approval. Results depend on preparation and performance.
Watch this related 1ExamPrep YouTube video about roofing contractor exam preparation, open-book testing, roofing safety, reference books, and study strategies.
The video focuses on Mississippi Roofing Contractor licensing, but its roofing study methods and reference-navigation advice are relevant to candidates preparing for the New Mexico GS-21 classification.
New Mexico reminder: Use the current April 2026 PSI GS-21 format of 75 questions, 200 minutes, and 75% passing. Other states have different examinations, rules, and approved books.
Creator: 1ExamPrep.
Video: How to Pass the Mississippi Roofing Contractor Exam.
Relevant topics: Roofing licensing preparation, approved references, safety, open-book study, and examination strategies.
Video jurisdiction: Mississippi.
This blog's jurisdiction: New Mexico GS-21 Roofing.
Current GS-21 exam: 75 questions, 200 minutes, 75% passing.
Use New Mexico CID and PSI for official licensing, reference, and examination rules.
Use Contractor Exam Preps for roofing courses, approved-reference preparation, book rentals, business-law learning, and related construction study books.
GS-21 trade: 75 questions, 200 minutes, 75% passing.
Business and Law: 50 questions, 130 minutes, 75% passing or an approved course where accepted.
Trade references: OSHA, New Mexico codes, IBC, IRC, Daniel Atcheson, NRCA manuals, and tile manual.
Business reference: NASCLA Basic 14th Edition and New Mexico licensing law.
Store products: GS-21 online courses, live instruction, rental books, roofing estimating, and Business and Law study.
Preparing for the New Mexico GS-21 Roofing Contractor examination is an important step for experienced roofing professionals who want to build or expand a contracting business.
Roofing contractors protect homes, commercial buildings, and other structures from rain, wind, heat, snow, and long-term weather damage.
Proper roofing involves more than installing visible materials.
It requires suitable deck preparation, correct underlayment, carefully selected roofing products, sound flashing details, fasteners, insulation, drainage, and safe work practices.
New Mexico regulates roofing work through the Construction Industries Division.
The state's roofing classification is GS-21.
Its scope includes installing, altering, and repairing roofing systems on new and existing roof decks.
It can include certain related flashing and sheet metal roof work.
The currently published classification rule requires two years of foreman-level practical or related roofing trade experience.
Applicants must document their experience and qualify through the state's application process.
A qualifying party demonstrates the required knowledge and experience for a licensed contractor business.
The GS-21 trade examination is administered by PSI.
The official April 3, 2026 bulletin lists 75 questions.
Candidates are allowed 200 minutes.
The passing requirement is 75%, shown as 57 points.
This is especially important because some roofing preparation products still describe an older 60-question examination.
Students should prepare for the format currently published by PSI.
The trade examination includes five official subjects.
Estimating and Plan Reading contains thirteen questions.
Surface Preparation and Planning contains ten questions.
Steep and Low Slope Roofing contains thirty-four questions.
Roofing Components contains eleven questions.
Safety contains seven questions.
These categories total 75 questions.
The largest subject is Steep and Low Slope Roofing.
It represents more than 45% of the examination.
Students should spend substantial time reviewing different roofing systems and installation practices.
Steep-slope roofing subjects include asphalt shingles, wood shakes, tile, slate, underlayment, flashing, fastening, roof decks, and ventilation.
Low-slope roofing subjects include built-up systems, modified bitumen, single-ply membranes, insulation, seams, flashing, and drainage.
Membrane roofing requires understanding how waterproofing systems work together.
Correct substrate preparation is important because even a quality roofing membrane may fail when installed over an unsuitable surface.
Estimating and plan reading are also major subjects.
Contractors must understand dimensions, roof areas, slope, material quantities, waste, and labor estimates.
Roofing Construction and Estimating by Daniel Atcheson provides useful information on these topics.
Surface Preparation and Planning includes existing roof conditions, roof decks, substrate compatibility, tear-off procedures, and repair planning.
Roofing Components includes flashing, penetrations, underlayment, insulation, roof accessories, and water drainage.
Safety includes OSHA construction rules.
Roofing professionals should study fall protection, ladders, scaffolds, protective equipment, material handling, and jobsite hazard awareness.
The GS-21 examination is open book.
However, candidates must provide approved references that comply with PSI's rules.
The approved books include OSHA 29 CFR Part 1926.
They also include the 2021 New Mexico Commercial Building Code and 2021 New Mexico Residential Building Code.
The 2021 International Building Code and 2021 International Residential Code are approved.
Roofing Construction and Estimating by Daniel Atcheson, 2022, is listed.
The current NRCA Steep Slope Roofing Manual reference is the 2025 edition.
The NRCA Membrane Roofing Manual reference is the 2023 edition.
The Concrete and Clay Tile Installation Manual, 2015, is also approved.
Candidates must verify the exact editions of their books before testing.
References may be highlighted, underlined, and indexed before the examination.
Permanent tabs are permitted.
Temporary tabs, handwritten notes, and loose papers are prohibited.
Writing inside reference books during testing is also prohibited.
The open-book format makes reference familiarity especially valuable.
A candidate should know whether a question belongs in an OSHA safety reference, building code, estimating manual, or NRCA technical guide.
Repeated book navigation helps save time.
New Mexico also requires a Business and Law qualification.
Contractor applicants may pass the PSI Business and Law examination or complete an approved alternative course.
The examination contains 50 questions, allows 130 minutes, and requires 75% passing, listed as 38 points.
It includes licensing, contracts, estimating, finance, taxes, labor, project management, liens, risk management, and safety.
The approved business reference list includes NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition, along with specified New Mexico laws and regulations.
Contractor Exam Preps offers a New Mexico Business and Law Complete Pass Package for this requirement.
The current PSI trade examination fee is $68.88.
The Business and Law examination fee is also $68.88.
The qualifying-party application has a separate $36 processing fee.
The business license process includes additional fees and requirements.
New Mexico requires a $10,000 contractor surety bond.
Licensed businesses must also maintain applicable registrations and coverage.
Contractor licenses are issued for three-year periods.
Contractor Exam Preps offers several related New Mexico GS-21 preparation options.
The GS-21 Roofing Online Exam Prep Course covers roofing systems, codes, safety, estimating, and reference navigation.
The live virtual and self-study program provides additional guided preparation.
The New Mexico Roofing Books and Courses Rental Package combines construction references, roofing manuals, business law materials, and course access.
Students should review rental terms and verify that the actual book editions match the current PSI bulletin.
The store also sells Roofing Construction and Estimating and other NRCA roofing study resources.
A six-week study plan can help organize preparation.
Start with licensing requirements, safety, and approved references.
Then study estimating and plan reading.
Continue with steep-slope roofing systems, membrane roofing, surface preparation, and components.
Finish with New Mexico building codes, Business and Law, and full timed practice tests.
With practical roofing experience, proper study materials, careful reference preparation, and consistent review, applicants can approach the New Mexico GS-21 Roofing examination with greater confidence.
New Mexico Roofing Contractor GS-21 Exam Prep helps roofing professionals understand the state's licensing requirements and prepare for the official PSI Roofing trade examination.
New Mexico uses the GS-21 Roofing classification for qualifying roofing contractor work.
The classification is regulated by the Construction Industries Division.
CID operates under the New Mexico Regulation and Licensing Department.
The license covers roofing installation, alteration, and repair within the authorized scope.
This work may involve residential and commercial roofing systems.
Roofing contractors install materials that help keep water and weather out of buildings.
The work includes roofing coverings, underlayment, flashing, insulation, drainage, repair, and related components.
The currently published GS-21 rule requires two years of foreman-level practical or related trade experience.
Qualifying-party applicants must document their experience through the proper application and affidavits.
PSI handles the examination approval and testing process for New Mexico CID.
Candidates must be approved before scheduling their examination.
The GS-21 Roofing trade examination contains 75 questions.
The time limit is 200 minutes.
The passing score is 75%, listed as 57 points.
These requirements are published in the official PSI bulletin updated April 3, 2026.
Some study product pages still mention 60 questions and 150 minutes.
Those older figures should not replace the official bulletin.
The current GS-21 Roofing examination includes five subjects.
Estimating and Plan Reading accounts for thirteen questions.
Surface Preparation and Planning accounts for ten questions.
Steep and Low Slope Roofing accounts for thirty-four questions.
Roofing Components accounts for eleven questions.
Safety accounts for seven questions.
These subjects total 75 questions.
Steep and Low Slope Roofing is the largest subject.
It covers different roofing materials and systems.
Steep roofing study includes asphalt shingles, shakes, tile, slate, underlayment, fasteners, roof decks, flashing, and ventilation.
Low-slope study includes built-up roofing, modified bitumen, single-ply membranes, insulation, attachment methods, seams, and roof drainage.
Students should understand the basic purpose of each system and the important installation details.
Surface Preparation and Planning includes inspecting roof decks and identifying conditions that may affect roof performance.
Existing roofing conditions, moisture, damage, substrates, and reroofing planning are important subjects.
Roofing Components includes flashing, gutters, penetrations, drip edges, insulation, ventilation products, underlayment, and other accessories.
Each component helps the roof system perform correctly.
Estimating and Plan Reading is also important.
Roofing contractors need to calculate roof areas, measure slopes, read plans, prepare material estimates, and understand quantities.
Roofing squares, waste factors, labor estimates, and material takeoffs are useful subjects to practice.
Safety accounts for seven trade questions.
Roofing involves elevated work, ladders, scaffolding, weather exposure, tools, and material handling.
Contractors should study fall protection, personal protective equipment, and OSHA construction safety.
The exam is open book.
Approved books must match the PSI reference list.
The current references include OSHA 29 CFR Part 1926 and New Mexico's 2021 commercial and residential building codes.
The 2021 International Building Code and 2021 International Residential Code are also approved.
Roofing Construction and Estimating by Daniel Atcheson, 2022, is included.
For steep roofing, the current listed reference is the NRCA Roofing Manual: Steep Slope Roof Systems, 2025.
For membrane roofing, PSI lists the NRCA Roofing Manual: Membrane Roofing Systems, 2023.
The Concrete and Clay Tile Installation Manual, 2015, is another approved book.
Candidates must bring their approved bound reference books to the examination center.
The books may be highlighted or underlined before testing.
Permanent tabs may be used.
Temporary tabs, handwritten notes, loose papers, and writing in the books during testing are prohibited.
Students should practice using each reference before exam day.
Good book navigation can save valuable time during a 200-minute examination.
New Mexico also requires a Business and Law qualification for contractor licensing.
Candidates may pass the PSI Business and Law examination or complete a state-approved alternative course.
The exam contains 50 questions and allows 130 minutes.
Its passing requirement is 75%, listed as 38 points.
The Business and Law examination covers licensing, business organization, contracts, estimating, finance, tax law, labor laws, project management, liens, risk management, and safety.
The approved references include NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition, and specified New Mexico licensing laws and regulations.
Contractor Exam Preps offers a Business and Law Complete Pass Package designed around these subjects.
The published PSI fee for GS-21 Roofing is $68.88.
The Business and Law exam also costs $68.88.
The qualifying-party application has a separate $36 processing fee.
Business licensing requires additional forms, fees, and compliance documents.
New Mexico requires qualifying licensed contractor businesses to maintain a $10,000 surety bond.
Applicable tax registration and workers' compensation rules also matter.
Contractor licenses are issued for three years.
Contractor Exam Preps offers several useful products for New Mexico GS-21 candidates.
The New Mexico PSI GS-21 Roofing Online Exam Prep Course supports roofing reference review and trade preparation.
The GS-21 Live Virtual and Self-Study Training offers another learning option.
The GS-21 Roofing Books and Courses Rental Package includes roofing manuals, codebooks, safety references, and business materials.
The store also sells Roofing Construction and Estimating as a separate book.
Students should verify book editions before purchasing or renting.
A six-week preparation schedule can begin with safety, licensing, and estimating.
Later weeks should cover steep roofing, membrane systems, surface preparation, roofing components, and building codes.
The final week should focus on Business and Law, reference navigation, and full timed practice.
With consistent preparation, correct approved references, roofing experience, and an understanding of the state licensing process, candidates can approach New Mexico GS-21 Roofing Contractor licensing with greater confidence.
Explore New Mexico roofing courses, roofing construction books, NRCA manuals, building code study resources, OSHA preparation, and contractor Business and Law materials at ContractorExamPreps.com.
