Rubber roof vents?

[Joshua L. Frederick]

Anyone know what these white caps/penetrations are? Commercial building....

[Lawrence W. Losciale]

I forget the prpoer name but what they do is as wind blows across the roof they creat a negative pressure under the membrane effectively sucking it down. the harder the wind the better the membrane is held in place.

[Bob Elliott]

Something like this no doubt.http://www.roofrocket.com/roofing_bl...to-catch-wind/

[Lawrence W. Losciale]

Originally Posted by belliott

Something like this no doubt.http://www.roofrocket.com/roofing_bl...to-catch-wind/

Different brand but that's what it is!