Roof water proofing
Roof water proofing
(OP)
A flat roof of building is leaking. Buidling is old so do not want to place some heavy water proofing material on it.
Can you recommend some good material. Also slab is depressed at middle (may be 3 inches). Is there some thing we can place thicker in middle and thins out to ends to mock a sloping roof.
Can you recommend some good material. Also slab is depressed at middle (may be 3 inches). Is there some thing we can place thicker in middle and thins out to ends to mock a sloping roof.






RE: Roof water proofing
RE: Roof water proofing
What caused the low spot?
If you can tear off the old roof, consider using tapered insulation or a non-structural self leveling compound to fill in the low spot.
If the roof structure is underdesigned there are several types of unballasted single ply membranes available that you could use to re-roof and keep your dead load down.
What kind of roof deck do you have? Does the existing roof pitch and drain properly, other than the low spot?
Regards.
RE: Roof water proofing
When you have lemons, make lemonade.
RE: Roof water proofing
LWIC and membrane will weigh about 8 to 10 psf for reasonable thicknesses, but can easily jump up to 12 to 14 psf if the LWIC gets too thick. Tapered insulation and membrane will come in at 6 to 8 psf.