Atlas OSB Over Plank Decking: Approval Has Limits
Bulletin date: not stated in source
Atlas describes mechanically fastened OSB over existing deck boards as a potentially suitable substrate, subject to local approval. Its acceptance does not warrant the double-deck installation or damage caused by the substrate
Atlas technical bulletin: Decking Deviation - OSB over Deck Boards.
What this means for your roof
Atlas describes mechanically fastened OSB over existing deck boards as a potentially suitable substrate, subject to local approval. Its acceptance does not warrant the double-deck installation or damage caused by the substrate. The proposed assembly needs structural and code review as well as shingle compatibility.
A useful question for your contractor
Who has confirmed the overlay attachment and local approval for this deck?
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: not stated in source. The date shown identifies the manufacturer document used for this summary.
Read Atlas: Decking Deviation - OSB over Deck Boards
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.