Install A Deck On Top Of A EPDM Flat Roof. - Roofing/Siding - DIY Home Improvement | DIYChatroom

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Old 07-31-2010, 10:35 PM   #16
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Hi Grumpy,
Thanks for the write-up. That really helped clarified things right up.
I agree on the concern about fasteners tearing thru the EPDM, and the proper installation method for the job.

Ok, just to wrap up the story...
Step by step process:
1) Complete tear-off: check. All old roofing was removed down to the plywood sheathing. All plywood damage was removed and replaced. (NO other damage found, other than drywall).
2) Insulation: Not a requirement - No insulation installed.
3) Black fiberboard was installed over the plywood. (Celotex blackboard, it was a compressed fiber/cardboard like material)
The fiberboard was attached with NO nails - I used liquid nails to secure it in place. (ha ha, does LIQUID nails count?)
4) EPDM was applied over blackboard and draped (down) over the sides and secured to the wall with metal attaching strips screwed to the wall.
The EPDM is installed per the ballast method - no adhesive. (The deck will be the ballast).

The deck will be sitting directly on the roof.
5) I will use left-over EPDM (strips) as a sacrificial layer between the EPDM (roof) and the deck runners.

My original idea was to use concrete fiberboard as an additional wear/chaffing surface between the sacrificial EPDM strips and the runners.
The material layering would be like: EPDM (roof) -> EPDM (sacrificial strip) -> Concrete fiberboard -> Runner -> deck.
But seeyou recommended forgetting the concrete fiberboard, so I tossed the idea.

Thanks all for the help and clarification.


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Old 08-02-2010, 03:35 PM   #17
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In addition to the sacrifical layer it wouldn't hurt to procure some neoprene/rubber walk way pads. A little extra cushion never hurts.


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