Atlas Roofing Over Existing Shingles: A Narrow Exception
Bulletin date: not stated in source
Atlas limits the described roof-over method to one existing layer of flat three-tab shingles over a sound deck. It excludes wood, architectural and laminated roof coverings from that method
Atlas technical bulletin: Install Asphalt Shingles Over Existing Asphalt Shingles.
What this means for your roof
Atlas limits the described roof-over method to one existing layer of flat three-tab shingles over a sound deck. It excludes wood, architectural and laminated roof coverings from that method. Flashing, underlayment and longer fasteners still matter, and the cited Signature Select warranty does not apply to a roof-over.
A useful question for your contractor
Does this roof meet every roof-over condition, or would tear-off reveal problems that should be repaired?
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: Install Asphalt Shingles Over Existing Asphalt Shingles
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.