Edpm or grp ?
Hey all
My architect has spec’d edpm but talking to some roofers they say that’s the wrong way to do it and should be grp ..
So I’m not sure now !
My flat roof can be parked on and has 4 skylights .
so bottom up structure is :
reinforced concrete
high compressive insulation
osb ? If using edpm or just grp
reinforced poured concrete
chippings
sand
driveway blocks
I guess the risk with edpm
Needs a comment from @SteamyTea, who has professional experiresponsibility me with GRP but perhaps not under concrete.
I would be suspicious about GRP as it is brittle at the joints. Need to be sure no one walks on one, and that it is protected by the concrete.
Presumably you are casting drains into the concrete surface.
F