Atlas Attic Ventilation: Balance Intake and Exhaust
Bulletin date: not stated in source
Atlas describes ventilation as a balanced system rather than a count of roof vents. Its bulletin gives net-free-area requirements and conditions for a reduced ratio
Atlas technical bulletin: Attic Ventilation.
What this means for your roof
Atlas describes ventilation as a balanced system rather than a count of roof vents. Its bulletin gives net-free-area requirements and conditions for a reduced ratio. Intake must remain open, and vent manufacturers’ actual capacities should be used. Current product instructions and local requirements must be checked together.
A useful question for your contractor
What are the calculated intake and exhaust capacities for this attic?
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.
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.