Assembly detail · Harrison, New York
Roof Ventilation Plan
Coordinate assembly intent, insulation, and air sealing.
Keep the Roof Ventilation Plan brief focused on vented or unvented assembly intent; intake and exhaust path; baffles and insulation clearance; bath or kitchen exhaust termination; calculation and verification responsibility. Every Roof Ventilation Plan line needs a known condition, a remaining uncertainty, and a named person responsible for the final answer. 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.
Vented or unvented assembly intent
Establish whether the intended attic or roof assembly is vented or unvented. Adding a vent without understanding that design can conflict with the insulation and moisture strategy.
Intake and exhaust path
For a vented design, ask where air enters, how it travels, and where it exits. Openings need a planned path, not simply more visible vent products.
Baffles and insulation clearance
Baffles and insulation clearance help preserve the intended intake path. Have the provider explain the eave detail and how roofing work avoids blocking it.
Bath or kitchen exhaust termination
Bathroom, kitchen, and other exhausts should be evaluated as separate systems. Moist air discharged into the attic can create a problem that new shingles do not solve.
Calculation and verification responsibility
Assign calculations, code review, installation, and verification to qualified people. Keep the assembly decision in writing when roofing and insulation contractors have separate scopes.
Prepare the property
Keep these details on one sheet
- Vented or unvented assembly intent
- Intake and exhaust path
- Baffles and insulation clearance
- Bath or kitchen exhaust termination
- Calculation and verification responsibility
Before authorizing work
What record belongs with “vented or unvented assembly intent” before work begins?
Request a dated description and the evidence supporting the proposed treatment. Cross-check entries: intake and exhaust path; baffles and insulation clearance. Named responsibility: bath or kitchen exhaust termination. Closeout file: calculation and verification responsibility. Identity check for Roof Ventilation Plan: confirm the business, applicable County license, roofing insurance, and current Harrison permit steps separately.