Assembly detail · Harrison, New York
Roof Underlayment Selection
Connect underlayment to covering, slope, deck, and instructions.
Treat the five items below as one connected decision: roof covering and slope, deck type and condition, climate and eave exposure, fastening or adhesion method, and manufacturer and code requirements. A change in one can alter the assembly, sequence, or responsible party. Stay on the ground or in a safely accessible interior area. Roof access, destructive inspection, and installation belong with qualified people using proper protection.
Planning factors
Five decisions worth documenting
Use the headings as a proposal check. The actions beneath them are specific to this project decision.
Roof covering and slope
Start with the selected covering and actual roof slope. Underlayment requirements can vary with that combination, so a single roll name is not a full specification.
Deck type and condition
Verify the deck material, surface condition, and suitability for fastening or adhesion. A product cannot compensate for an unresolved damaged or wet substrate.
Climate and eave exposure
Identify eaves, valleys, and other exposure details that require a specific treatment. Ask how the choice fits climate, the assembly, and manufacturer instructions.
Fastening or adhesion method
The proposal should state attachment, overlap, transition, and compatibility requirements by reference to the approved system. Homeowner improvisation is not part of that plan.
Manufacturer and code requirements
Keep product identifiers and detail photographs taken at the appropriate stage. Once covered, the layer is difficult to verify from an attractive finished-roof view.
Prepare the property
Keep these details on one sheet
- Roof covering and slope
- Deck type and condition
- Climate and eave exposure
- Fastening or adhesion method
- Manufacturer and code requirements
Before authorizing work
What record belongs with “roof covering and slope” before work begins?
Request a dated description and the evidence supporting the proposed treatment. Cross-check entries: deck type and condition; climate and eave exposure. Named responsibility: fastening or adhesion method. Closeout file: manufacturer and code requirements. Identity check for Roof Underlayment Selection: confirm the business, applicable County license, roofing insurance, and current Harrison permit steps separately.