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

T TEEC CHHN NIIC CAAL LAAD DVVIIS SOOR RYYB BUUL LLLE ETTIIN N To: GAF Commercial Sales, GAF Contractors, GAF Field Services From: Technical Services Department Issued Date: 05/01/2015 Date: Revised 05/27/2011 Date: xx/xx/20xx Subject: Repairing Hail Damage to Granule Surfaced Membranes No: TAB-C 2015-31

What Is The Concern? Impact damage from hailstones can scour a roof surface by displacing the protective granules on granule surfaced membranes. Knowing what to look for, what to do and how to repair minor impact damage can save time and money.

What If This Happens To GAF recommends property owners document all storm related damage, collect local weather My Roof? service data and notify their respective insurance carrier as appropriate. Additional steps include: • Visual Inspection: Check the appearance of the roof for damage. • Document Damage: Take photographs of any visible damage as soon as practical.

What Can Be Done To Coating the damaged roof membrane... is an acceptable solution when there is visible granule loss Repair Minor Hailstorm but no other obvious damage to the roof membrane or underlying substrate. This type of repair is considered to be an owner maintenance item. Damage? Do not... repair the membrane using a coating if impact damages are severe enough to cause leaks or allow moisture entry into the roofing membrane and building envelope. This type of repair is not appropriate if any of the following are present: • Cuts • Punctures • Tears • Cracks For more information about appropriate repairs for these types of conditions, refer to Technical Advisory Bulletin TAB-C-2013-21.

Can Latent Damage Be Yes... latent damage can be present even when visual examination does not reveal significant Present? observable impact evidence. • Latent hail damage may become evident after the roof is coated and as the roof ages. GAF typically does not take field cut tests or perform laboratory analysis on hail damaged roofs. • Where a more detailed sampling and analysis of roof system damage is needed, GAF will recommend field sampling by the contractor for testing at an accredited lab and will provide technical support for review of the results.

How Do I Make The Repairs should be completed as soon as possible in order to reduce the potential for further Repair Using An damage. A GAF Certified Contractor should be enlisted to make all roofing repairs. Refer to GAF’s TOPCOAT® Application & Specifications Manual for more detailed information. Acceptable GAF Coating? • Identify roof areas where hail has caused excessive granule loss. • Prepare the surface for appropriate coating application. • Apply approved TOPCOAT® liquid-applied roof coating to damaged area. • If desired, colored roofing granules can be broadcast into the wet coating to match existing roof color and texture of the existing roof.

Commercial Does The GAF Diamond No… leaks, defects or deficiencies in the roof deck or roof system caused by unusual Pledge™ Roof System weather conditions or natural disasters, including hail, are specifically excluded from guarantee coverage. Guarantee Cover Hail Damage?

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Where Can I Get More GAF Technical Services Can Assist You… with these and other questions you may have regarding Information? your new roof installation. GAF Technical Services can be contacted at 800-ROOF-411 (800-766- 3411). Also, the GAF website is a great resource for just about any question you may have or for additional information you may require. Please visit www.gaf.com to find the latest information on our products and their installation. Important: This document supersedes any prior GAF Technical Advisory Bulletins on this topic. Please always check www.gaf.com to make sure you have the most up to date information.

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