Atlas Roof Deck Movement: Why New Shingles Can Look Wavy
Bulletin dated: May 2021
Atlas links visible buckling to deck movement, moisture, panel spacing and ventilation. Wet or wrinkled underlayment can also transfer an uneven shape through the shingles
Atlas technical bulletin: Deck Movement - Causes & Concerns.
What this means for your roof
Atlas links visible buckling to deck movement, moisture, panel spacing and ventilation. Wet or wrinkled underlayment can also transfer an uneven shape through the shingles. Replacing the visible shingles alone may leave the underlying cause unresolved. The deck and underlayment should be dry and properly prepared before roofing proceeds.
A useful question for your contractor
What caused the movement, and how will that cause be corrected?
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 dated: May 2021. The date shown identifies the manufacturer document used for this summary.
Read Atlas: Deck Movement - Causes & Concerns
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.