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-   -   EPDM leaking tar-like goop (http://www.diychatroom.com/f9/epdm-leaking-tar-like-goop-76669/)

Powdoo 07-20-2010 11:06 AM

EPDM leaking tar-like goop
 
Hi, I'm new to your forum and would appreciate any help that can be provided. We own a catering hall and do most of our maintainence ourselves.

I have an 800 square foot epdm roof that is 12 years old. It has only two seams, and covers a large walk-in cooler outside. The installation used metal bands to screw down the edges of the epdm about 2" below the roof along the exterior walls of the unit.

It is leaking black goop from the metal bands, and has leaked a bit from the ceiling of the cooler as well. It is caustic stuff, taking the paint off of the exterior where it drips.

Has anyone seen this type of thing before? If so, what options for repair can you suggest?

seeyou 07-21-2010 06:24 AM

What's under the EPDM? Sounds like it may have been installed over a built up tar roof or something that's reacting with the rubber. Or you've got a seam leak and that's the water coming out carrying remains of whatever the EPDM was installed over.

Powdoo 07-21-2010 08:06 AM

Thank you for taking the time to reply. I honestly cannot say what is under it. The roof covers a large walk in cooler, which is made up of panels that are essentially dense foam with sheet metal exterior. I too have assumed that there must be water getting in and reacting with something, but did not know if that could be an adhesive (would one have been used?), or something else in there.

If we were to reseal the seams without seeing what is underneath I worry that we simply will be sealing the problem in... should we peal it back and take a look?

seeyou 07-21-2010 08:11 AM

Quote:

Originally Posted by Powdoo (Post 472839)
Thank you for taking the time to reply. I honestly cannot say what is under it. The roof covers a large walk in cooler, which is made up of panels that are essentially dense foam with sheet metal exterior. I too have assumed that there must be water getting in and reacting with something, but did not know if that could be an adhesive (would one have been used?), or something else in there.

If we were to reseal the seams without seeing what is underneath I worry that we simply will be sealing the problem in... should we peal it back and take a look?

Probably. Posting some pictures here might help us help.

ZnCuSnRoofer 07-21-2010 08:38 AM

I have seen this before:
A client had a sun room added on; the roof of the add on was dense foam panels with a sheet metal skin. Probably similar to the construction of your walk in.
The contractor who erected it applied a peel and stick foil faced membrane to the roof. After a few years it failed and another contractor applied black shingles.
The following year the black shingles and the foam panels got so hot that it melted the peel and stick membrane that was left in place underneath the shingles; it would get really bad in +90 degree days. The peel and stick material would run out under the shingles and drip down in long sticky strings.

My advice would be to have any open seams checked and repaired; after the membrane is determined to be sound I would have the roof coated; something white and suitable for EPDM. If it is the same material I ran into the best way to stop it is to keep it cool so it doesn't run.

Good Luck,
Tom

Grumpy 07-27-2010 02:01 PM

Pictures would definetly help. I don't know what black goop an EPDM roof could be leaking. Is there some kind of vent fan over this area of the roof that is exhausting grease onto the roofing system? You say you have a catering business so I can only assume from my experience replacing or repairing roofs on restauraunts that this is the case. How often do you clean your grease traps around the exhaust fans on the roof?


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