Owens Corning lists acceptable surfaces for Titanium PSU30 and specific limits for board decking. Some substrates need primer, and tongue-and-groove boards are not permitted in this bulletin
Owens Corning technical bulletin: Acceptable Substrates Titanium PSU30 Technical Bulletin.
What this means for your roof
Owens Corning lists acceptable surfaces for Titanium PSU30 and specific limits for board decking. Some substrates need primer, and tongue-and-groove boards are not permitted in this bulletin. Approval for this membrane does not establish that the same surface is suitable for direct shingle fastening.
A useful question for your contractor
Ask for the membrane substrate and shingle fastening base to be checked separately.
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: August 2025. The date shown identifies the manufacturer document used for this summary.
Read Owens Corning: Acceptable Substrates Titanium PSU30 Technical 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.