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

T TEEC CHHN NIIC CAAL LAAD DVVIIS SOOR RYYB BUUL LLLE ETTIIN N To: GAF Residential Sales, GAF Contractors, GAF Field Services From: Technical Services Department Issued Date: 12/26/2017 Date: Revised 05/27/2011 Date: 5/12/2022 Subject: Roof Repair Underlayment Requirements For Hips And Ridges No: TAB-R-2017-164

What Are The For hips, the underlayment should … be lapped over the hips at least 4” (102 mm) to 6” (152 mm) Underlayment as would be done on a new or complete tear-off installation. Follow the general instructions below: Requirements For Hips  End nails of each course of shingles that are being left on the adjacent roof plane must be When Only Replacing A removed so that the underlayment may be inserted between the shingles and existing Single Roof Plane? underlayment.  Use a 12” (305 mm) to 18” (457 mm) strip of underlayment to run along the hip and overlap the new underlayment on the replacement plane at least 6” (152 mm) to 12” (305 mm).  Once complete, the existing shingles must be re-nailed and then the new hip cap can be installed.

NOTE: If the hip includes a hip vent, then the new underlayment must be trimmed to the edge of the vent slots so it will not interfere with air movement.

What Are The For ridges, the underlayment should … be lapped over the ridge at least 4” (102 mm) to 6” (152 Underlayment mm) as would be done on a new or complete tear-off installation. Follow the general instructions below: Requirements For Ridges  Nails of the top course of shingles that are being left on the adjacent roof plane may need to When Only Replacing A be removed so that the underlayment may be inserted between the shingles and existing Single Roof Plane? underlayment.  Use a 12” (305 mm) to 18” (457 mm) strip of underlayment to run along the ridge and overlap the new underlayment on the replacement plane at least 6” (152 mm) to 12” (305 mm).  Once complete, the existing shingles must be re-nailed and then the new ridge cap can be installed.

NOTE: If the ridge includes a ridge vent, then the new underlayment must be trimmed to the edge of the vent slots so as not to block the venting.

Will Reusing Existing No... The GAF Shingle & Accessory Limited Warranty will remain in effect per its terms and Materials Or Not conditions, however, any damage due to reusing existing shingles, ridge cap, underlayments or leak barriers is not covered under the terms of the limited warranty. The GAF Shingle & Accessory Following These Limited Warranty covers manufacturing defects only; it does not cover the workmanship of the Instructions Void My roofer who installs the shingles, the design of the roof, or the installation/performance of the roof Shingle Limited deck. GAF makes no representation or warranty that the installation conforms to local code requirements and assumes no responsibility for code compliance. Warranty?

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

Residential 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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