Installation & Repair · Low-slope membranes

GAF TAB-C 2015-31: Repairing Hail Damage to Granule-Surfaced Membranes

GAFManufacturer bulletin

GAF's commercial technical advisory bulletin on hail that scours granules off a granule-surfaced membrane: what to inspect for, when coating the membrane is an acceptable repair, and the Diamond Pledge guarantee question that follows a coating repair.

Source: GAF Technical Services · Manufacturer bulletin · 2015

GAF technical bulletin
granule surfaced membrane
hail damage repair
roof coating repair
commercial roofing
granule loss
Diamond Pledge
membrane inspection

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Repairability Assessment for Evaluating Asphalt-Composition Shingle Roof Repairs (verbatim transcription)

A verbatim, unedited text transcription of Chad T. Williams's peer-reviewed NAFE article on the Repairability Assessment Method — a structured way to judge whether an asphalt shingle roof can be spot-repaired without propagating damage. Figures are not reproduced; the published citation and copyright notice head the file.

NAFEJournal of the National Academy of Forensic Engineers — Chad T. Williams, PE · 2020

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GAF TAB-R-178: Mixing New and Aged Asphalt Shingles

GAF's bulletin on whether new shingles can be used to repair an aged roof — it allows it when dimensions and exposure match, warns that a perfect color blend is "not likely," forbids trimming shingles to match, and notes aged shingles crack during repair. Central to matching disputes.

GAFGAF Residential Consumer Services · 2025

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GAF TAB-R 2017-164: Underlayment Requirements for Hips and Ridges on a Single-Plane Repair

One-page GAF bulletin on how underlayment must be lapped over a hip when only one roof plane is being replaced, including removing end nails on the adjacent plane and re-nailing — the detail that turns a single-slope repair into work on the neighboring slope.

GAFGAF Technical Services · 2017

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