Anyone know what these white caps/penetrations are? Commercial building…
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.
Something like this no doubt.http://www.roofrocket.com/roofing_blog/roof-repair/roof-vent-designed-to-catch-wind/
Different brand but that’s what it is!