Roofing Talk - Professional Roofing Contractors Forum banner
1 - 3 of 3 Posts

·
Roofing Relapse
Joined
·
2,552 Posts

·
Roofing Relapse
Joined
·
2,552 Posts
I've read specs saying on lay-overs to use 1 of the smaller 1 way breathers per 10 squares. That's a modofied bitumen spec though, which honestly never made sense to me since mod bit should be fully adhered, but what ever.

I know this is not scientific, but generally speaking on a 1,000 sq ft foot print, I would see 2 of the larger 6" 2 way vents. That doesn't mean it's right or wrong, just that is what is common practice (from the roofers that actually ventilate) in my area.

Contact the vent manufacturer and see if they have a spec sheet on their products with NFA, and contact the single ply manufacturers you work with and ask if they have a NFA recomendation.
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top