Atlas Over ZIP Roof Decking: Follow Both Manufacturers
Bulletin date: not stated in source
Atlas accepts ZIP roof decking subject to its listed installation, ventilation and code conditions. The bulletin distinguishes slopes at or above 4:12 from lower slopes and calls for underlayment during subsequent reroofing
Atlas technical bulletin: ZIP System Approval.
What this means for your roof
Atlas accepts ZIP roof decking subject to its listed installation, ventilation and code conditions. The bulletin distinguishes slopes at or above 4:12 from lower slopes and calls for underlayment during subsequent reroofing. The original assembly and a replacement roof should not be assumed to use identical details.
A useful question for your contractor
Does the proposed ZIP assembly satisfy both the decking and shingle requirements for this slope?
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: ZIP System Approval
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.