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Posted: Sep 20, 2006 04:31 PM
epdm roof overlay
just looked at a building with epdm on it now that is leaking. was thinking about screwing down plywood over top and flashing the drainage edge then putting spf system down. will that work and is there a better way.
Gerry Wagoner
Posted: Sep 20, 2006 08:09 PM
There are numerous ways to renovate an older EPDM roof with spray-on systems.

The plywood will work if they need some insulation (SPF).

If all they are after is leak proofing, then I would consider using 540-A polyurea over it.

How is the EPDM roof fastened? You could add more fasteners and spray right to the old rubber after priming.

Posted: Sep 20, 2006 11:08 PM
epdm is ballasted with 1-3" rock. what about a single component coating.
Gerry Wagoner
Posted: Sep 24, 2006 08:06 AM
Single component would work too. You will need a fastener every 5 ft2.

Aaron Scurlock
Posted: Sep 25, 2006 08:01 PM
Now we're talking....not EPDM, but Trocal PVC....I have a customer that has a trocal roof that springs leaks. It isa ballasted roof. I was thingking of moving ballast, cutting flashings down, cleaining, priming, 540-A, cure, and replace ballast.

I would only offer my warranty on it. I think it would work.

What do you guys think? The 540-A is some awesome stuff.
Gerry Wagoner
Posted: Sep 26, 2006 11:54 AM
Sounds good. Wash well and use #11 primer (unless they say different).

I would recommend foam on the flashings, btw. 40-45 mils of 540 should do the trick.

Melvin Chandler
Posted: Sep 27, 2006 10:28 PM
Have you tried VFI's roofing foam? What did you think?
Gerry Wagoner
Posted: Sep 28, 2006 08:52 PM
Liked it.

Aaron Scurlock
Posted: Oct 05, 2006 08:38 AM
Melvin Chandler
Posted: Oct 07, 2006 01:04 AM
Aaron, Have you had much experience with Trocal? I'd be scared to spray over that product with just about anything.
Aaron Scurlock
Posted: Oct 15, 2006 09:24 PM
Because of the splitting of the PVC or the adhesion? Maybe better to tear and ???

If I have to do foam, Im getting another proportioner. :)
Melvin Chandler
Posted: Oct 16, 2006 06:04 PM
The splitting. I don't think there's much of an issue with the adhesion but I'm not the one to answer that question either. I've seen those systems split and not into 1/4" splits. When they go, sometimes the gap is 2-3 inches wide by 10-12' long. I'd bet that 540 would do a good job of holding it together and keeping it from splitting but I'd be afraid to take that chance without someone taking a sip out of the cup before I did.

You could just call me. I'll foam it for you or haul it up and let that MrEguy spray it.
Victoria Morgon
Posted: Aug 07, 2020 11:57 AM
One of the unique attributes of EPDM is its ability to be easily repaired and restored – an attribute never seen before in the roofing industry. Unlike other roof systems that may degrade and become brittle over time from ultraviolet exposure, EPDM maintains its integrity and flexibility. Because of this, EPDM allows for modifications as easy as washing the membrane, preparing the surface and applying the repair material, including coatings. Perhaps coating the EPDM roof is the best option to restore it like a new. Coatings like EPDM Liquid Rubber can restore an existing roof to like-new; delaying the need for roof replacement by adding up to 18 to 20 years of guaranteed life protection to your current roof.

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