Racking Shingles: Why the Installation Pattern Matters
Bulletin revision: February 1, 2021
GAF distinguishes vertical racking from the installation patterns required for laminated shingles. The wrong method can contribute to missed nails, distortion and visible pattern problems.
GAF technical bulletin: Racking of shingles.
What this means for your roof
GAF distinguishes vertical racking from the installation patterns required for laminated shingles. The wrong method can contribute to missed nails, distortion and visible pattern problems.
A useful question for your contractor
Ask whether the crew is following the exact layout instructions for the selected product.
Ask for the answer to be tied to the actual roof condition and the exact product being installed. Keep the agreed repair or installation detail with your estimate and project photos.
Bulletin revision: February 1, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
This homeowner summary explains the cited bulletin. The complete manufacturer document and current product instructions govern the installation details. A requirement for one manufacturer or product should not be transferred to another without checking.