[quote=“flatroof”]I have a BUR + cap sheet flat roof which drains fairly well, but there are areas where water will pond up to 1" deep.
My plan is to add some drains, but I also want to cover over some areas which look a bit worn. In general, what is the best material for this re-cover if there is some ponding? Which one will bond best to the existing roof?
asphalt + 1 layer fg + asphalt + cap sheet
one layer of granule covered torchdown
The torchdown stuff is new to me, but a lot of local roofers are recommending it, and I wonder if this is because it is a better product, or because it’s less risky to install.
Does the roof leak? How old is the roof? Reason being, I don’t know that I would replace the roof if it is in reasonable good condition. You can deal with the ponding separately, by building the low areas up with extra layers of membrane or tapered insulation and membrane.
I don’t come around here much anymore, so you will probably need someone else to explain it all to you. Bottomline, don’t let someone sell you a roof just because your’s ponds. A 2- or 3-ply BUR with a modified bitumen cap sheet should last you 15-20+ years. Of course, a lot of that has to do with the roofing contractor that installed your roof.