I have an 8'x8' front porch with a flat roof with a central drain that is 6"x6", draining to a 3 or 4" pipe that runs to the corner of the porch, then down a pipe that is hidden in the porch column. The surface is flame-down tar. A leak developed at the seam between the roof surface and the drain box that I wasn't able to seal with various tar/polymer based materials. Annually, the roof ends up freezing, I believe because the drain freezes and backs up in the winter, Pittsburgh is known for a lot of freeze/thaw cycles. I clean out the drain annually, so there isn't any debris in it.
I want to fix it so that it lasts longer, how should I do that?
I'm considering an EPDM membrane and moving the drain closer to the down-ward segment of the drain so that it won't have a chance to freeze and backup... Any ideas?
I want to fix it so that it lasts longer, how should I do that?
I'm considering an EPDM membrane and moving the drain closer to the down-ward segment of the drain so that it won't have a chance to freeze and backup... Any ideas?