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Old 09-14-2011, 06:48 PM   #1
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Priming for EPDM

Hi folks!

I have a flat roof deck (living quarters underneath) that I have had to re-frame after years of wood rot. So, for the top, I've decided I will use EPDM.

My question is, what can I use to prime and seal the sheathing, that the EPDM and adhesives will properly bond to? I would like the roof sealed BEFORE adding the rubber, just so I know if I got a small tear in the EPDM, havoc would not break out.

Also have two sections with aluminum flashing, can I just use a metal primer for those, s the adhesive will stick? It is not bonderized.
One other question, will Pointing Mastic damage EPDM? It is Xylene based.

Thank you


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Old 09-14-2011, 09:55 PM   #2
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I'm not aware of any sealer that will be compatible with EPDM glue. And if you go straight to plywood, plan on picking out the splinters lifted by the glue to avoid punctures, and at the least, plenty of lumps and bumps from wood slivers under the EPDM.

"One other question, will Pointing Mastic damage EPDM? It is Xylene based." Does it say "Made for EPDM?" If not, I'd bet on plenty of damage.


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Old 09-15-2011, 06:47 AM   #3
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Rather then spending time and money sealing the sheathing, spend it on fastening an 1/2" of recover board/fiber board to the sheathing with plates & screws.

All metals should be primed before covering them.

You will be using to different glues:
1. Bonding Adhesive, which will be applied to the fiber board, epdm and walls.
2. Seam adhesive, for seams, flashing's, etc.

Use a soft push broom to run across the epdm after glue/laid down.
Use a hand roller on flashing's, seams, etc.

Don't forget to caulk all laps with a lap sealant, this will prevent dust/moisture from getting into the seams while they go through the curing process.

If you have a need for termination bar, etc., use some water block 'caulking' between the metal and the structure.
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