Roofing Technical Standards and Manufacturer Installation Guidelines

GAF Technical Standards and Certification Requirements

GAF is the largest roofing manufacturer in North America, and their certification program is one of the most rigorous in the residential roofing industry. GAF Certified contractors must demonstrate documented installation practices, maintain adequate insurance, and commit to ongoing technical training. The certification is not permanent. It requires annual renewal, and GAF reserves the right to revoke certification from contractors who fail to maintain their documented standards.

What makes GAF's technical bulletin library particularly valuable is its product-line specificity. GAF does not publish a single generic installation guide and call it sufficient. The Timberline series has its own step flashing bulletin, its own wall flashing bulletin, its own chimney flashing bulletin, and its own chimney cricket specification. The Sovereign series has a separate set of bulletins with metric-specific dimensions. Nail placement specifications are published per product line because the nailing zone location varies between shingle designs. A contractor who "installs GAF shingles" without referencing the specific bulletin for the specific product on that specific roof is not installing to manufacturer specifications, regardless of how experienced they claim to be.

1 Source Roofing holds active GAF Certified Contractor status. We install Timberline HDZ, Timberline AS II, and Camelot II product lines. Each installation follows the corresponding technical bulletin for the product being used. Our GAF Roofing Resources page provides additional detail on the manufacturer's product lines and warranty programs available to certified contractors.

GAF's warranty structure is tiered based on installation compliance. The standard System Plus warranty covers materials for the life of the shingle, but limits workmanship coverage. The Golden Pledge warranty, available only through GAF Master Elite and Certified contractors, extends workmanship coverage to 25 years and provides the strongest protection available under the GAF warranty program. That distinction matters when you are protecting a home valued at $800,000 or more. The warranty is only as strong as the installation it covers, and the installation is only as strong as the contractor's adherence to the published specifications.

CertainTeed Technical Standards and Installation Specifications

CertainTeed approaches technical documentation differently than GAF, but with equal rigor. Their bulletin library covers installation topics by method rather than by product line. CertainTeed publishes separate bulletins for open valley installation, closed-cut valley installation, laminate nailing preferences, drip edge installation, and cold weather procedures. This structure means a contractor working with CertainTeed products must reference multiple bulletins during a single installation to ensure every component of the roof system meets the published specification.

CertainTeed's StreakFighter algae resistance technology is particularly relevant for Atlanta installations. Georgia's humid climate creates conditions where Gloeocapsa magma, the algae responsible for black staining on roofs, thrives. CertainTeed's Landmark, Landmark Premium, and Grand Manor product lines incorporate copper-infused granules that resist algae colonization. The effectiveness of that algae resistance depends in part on proper installation — specifically, correct exposure dimensions and consistent overlap that allows rainwater to distribute the copper ions uniformly across the shingle surface. Deviation from the published exposure specifications can create zones where algae resistance is reduced.

CertainTeed's SureStart PLUS warranty provides non-prorated coverage for the first years of the roof's life, covering both materials and labor. Like GAF's warranty program, access to the strongest warranty tiers requires installation by a credentialed contractor who follows the manufacturer's documented specifications. 1 Source Roofing maintains active CertainTeed certification and installs Landmark, Landmark Premium, and Grand Manor product lines per the manufacturer's published installation requirements.

CertainTeed's bulletin on hail damage assessment is a reference document we use during post-storm inspections. Identifying legitimate hail damage versus normal granule weathering requires specific knowledge of what manufacturer-documented hail impact signatures look like. That bulletin provides the visual criteria and assessment methodology that supports accurate damage claims, and our inspectors reference it during every hail-related inspection we conduct.

Roofing Technical Standards by Topic

Each page below covers a specific area of roofing installation in detail, referencing the applicable GAF and CertainTeed technical bulletins. These are the ten installation topics where manufacturer specifications are most frequently misunderstood or ignored by contractors who prioritize speed over compliance.

Each of these topics represents an area where the manufacturer's specification is precise and where deviation creates measurable risk to the homeowner's warranty coverage and the roof's long-term performance. A contractor who dismisses these details as "just paperwork" is telling you something important about how they approach the work itself.

GAF Technical Bulletins and Installation Documents

GAF publishes product-specific technical bulletins covering every critical installation detail. Each bulletin below represents a document that our project managers reference during installation planning and that our crews follow during execution. These are the specifications that underpin GAF warranty coverage. We maintain current copies and update our installation procedures when GAF revises a bulletin.

Flashing Specifications

Installation and Nailing

Valleys, Underlayment, and Deck

Maintenance and Storm Damage

CertainTeed Technical Bulletins and Installation Documents

CertainTeed organizes their technical documentation by installation topic rather than by product line. Each bulletin below addresses a specific aspect of the roof installation process, with specifications applicable across CertainTeed's residential shingle product range. We reference these bulletins alongside GAF's documentation to ensure our installations meet or exceed every published requirement.

Installation Methods

Underlayment and Deck

Damage Assessment and Maintenance

How 1 Source Roofing Applies Manufacturer Standards on Every Project

Publishing a list of technical bulletins is the easy part. The difficult part is building an organization where those bulletins actually govern daily installation decisions. That requires a system, not just awareness.

Before any 1 Source Roofing project begins, the project manager identifies the specific manufacturer products being installed and pulls the corresponding technical bulletins for that job. A roof replacement using GAF Timberline HDZ shingles with a chimney and two wall flashings means pulling the Timberline shingle installation bulletin, the Timberline chimney flashing bulletin, the Timberline wall flashing bulletin, and the nail placement specification. The bulletins travel with the project file. They are not stored in an office filing cabinet while the crew works from memory on the roof.

During installation, our project managers verify compliance at each phase. Deck preparation is inspected against the applicable deck requirements bulletin before underlayment begins. Underlayment overlap and fastener patterns are verified before shingle installation starts. Flashing installations are documented with photography that can be compared directly to the manufacturer's published diagrams. Nail placement is spot-checked during installation, not assumed to be correct because the crew has done it before.

This documentation serves a practical purpose beyond quality assurance. If a warranty claim arises five or ten years after installation, our project files contain photographic evidence of specification-compliant installation at every phase. That documentation is what separates a straightforward warranty resolution from a denied claim where the homeowner bears the cost of a repair the manufacturer should have covered.

For homeowners who want to understand the specific standards that apply to their planned project, we are happy to walk through the relevant bulletins during the estimate process. Knowledge of what the manufacturer requires gives you the ability to evaluate any contractor's proposal against the actual standard. That evaluation is a conversation we welcome. Call (404) 277-1377 to schedule a consultation.

Building Codes, Professional Standards, and Georgia Guides

Beyond manufacturer bulletins, professional roofing requires a working knowledge of building codes, ASTM testing standards, structural engineering principles, and state-specific regulations. We built this knowledge center so roofers and homeowners can find authoritative answers in one place.

Building Codes and Regulations

Professional Standards and Science

Georgia-Specific Guides

Additional Resources from 1 Source Roofing

The technical standards covered on this page connect directly to the services and resources we provide across our website. These links will help you explore the specific areas most relevant to your roofing project.

• Our Roof Replacement page details the full installation process, from inspection through final walkthrough, for homeowners considering a complete roof replacement in the Atlanta metro area.
• The Roof Flashing Installation page provides an in-depth look at the flashing methods we use on Atlanta homes, including chimney, wall, and valley flashing applications.
• Visit our GAF Roofing Resources page for product information, color selections, and warranty details from GAF's residential shingle lines.
• Our GAF Certification and CertainTeed Certification pages explain what each manufacturer certification requires and how it protects your warranty coverage.
• Homeowners dealing with recent storm damage should review our Storm and Hail Damage Assessment page for manufacturer-documented criteria on evaluating shingle damage.
• For information on shingle styles and color options, see our Shingle Colors page with visual comparisons from GAF, CertainTeed product lines.

Every page on this site reflects the same standard of technical accuracy and transparency that we bring to the installations themselves. If you have questions about any of the content on this page, or if you want to discuss how these technical standards apply to your specific roof, we are available at (404) 277-1377.