Old Self-Adhered Underlayment Without an Ice-Dam Requirement
Bulletin dated: February 2026
For the conditions covered by this bulletin, Owens Corning describes mechanically fastened underlayment and a named-product slip-sheet option over limited retained membrane layers. It does not recommend simply adhering a new membrane to an unknown old surface
Owens Corning technical bulletin: Re-Roofing Over Existing Layer of S.A. NO Ice-Dam Protection Tech Bulletin.
What this means for your roof
For the conditions covered by this bulletin, Owens Corning describes mechanically fastened underlayment and a named-product slip-sheet option over limited retained membrane layers. It does not recommend simply adhering a new membrane to an unknown old surface. The named extended warranties require a clean deck instead.
A useful question for your contractor
Ask for the retained-layer count, specified underlayment and warranty eligibility to be recorded together.
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: February 2026. The date shown identifies the manufacturer document used for this summary.
Read Owens Corning: Re-Roofing Over Existing Layer of S.A. NO Ice-Dam Protection Tech Bulletin
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.