Installation & Repair · Shingle repair

Use of the Repairability Assessment Method for Evaluating Asphalt-Composition Shingle Roof Repairs

NAFEForensic paper

Chad Williams's peer-reviewed method for deciding whether an asphalt shingle roof can be repaired in place: a structured test of whether removing and replacing damaged shingles will itself damage the surrounding roof. The original published PDF, with figures.

Source: Journal of the National Academy of Forensic Engineers — Chad T. Williams, PE · Professional paper · 2020

repairability assessment method
asphalt shingle repair
spot repair
seal strip bond
repair versus replace
forensic engineering
shingle damage
partial slope repair

Download PDF Open in a new tabPDF · 15 pages · 6.2 MB

Provenance · Obtained from publicly circulated copies; no ownership claimed; removal honored on request

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Forensic paperArticle

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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Manufacturer bulletinPDF · 2 pages · 174 KB

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

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.

GAFGAF Technical Services · 2015

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Manufacturer bulletinPDF · 2 pages · 239 KB

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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