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Old 04-15-2013, 01:22 PM   #1
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Flat Roof EPDM


Hello, I have a question about a flat roof I am trying to repair. The roof is approximately 18' x 16'. I originally put the Black Jack Rubbr #57 from lowes on the wood directly. However, that material did not hold up well and started to crack.

I now have learned about the material EPDM and would like to install this on my flat room. A question I have is do I need to strip down the old material before laying down the EPDM? Is there an adhesive that I can purchase locally from Lowes or Home Depot that can go on this material to attach to the EPDM if a strip down is not necessary or impossible?

Your help and expertise is appreciated.

Thank you.

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Old 04-15-2013, 02:45 PM   #2
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Flat Roof EPDM


You can do a recover, but anything that is wet or damaged has to be removed, you will need perimeter nailers, and rigid board insulation. A rule of thumb in a recover is to put more R value under the new roof (Above the old membrane) than you have in the old roof. The insulation will be fastened to the structural deck with roof deck screws and 3 inch insulation plates. The glue is yellow glue and is a contact adhesive, so its good to know what you are doing. Check to see if they have a one sided adhesive, its much easier to work with.

Go to Firestone Building Products, EPDM Fully adhered, and read all you want.

Use .060" Unreinforced Black

You want to get some slope to drain, at least 1/4 inch per foot.

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Last edited by jagans; 04-15-2013 at 03:40 PM.
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Old 04-15-2013, 03:45 PM   #3
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Flat Roof EPDM


Thank you Jagan. Are you talking about something similiar to this?
http://www.homedepot.com/p/t/2025304...0#.UWxmGdLbO6w

Would these products break when we step on them?

Also, I can readily buy the .045 EPDM from a pond supplier made by firestone. Is this the same material and would .045 be sufficient?

Thank you.
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Old 04-15-2013, 03:58 PM   #4
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Flat Roof EPDM


No.

You are going to need to purchase all of the "Parts" to do this project from a Roofing supply outlet like Allied roofing Supply, Bradco Supply, The Roof center, etc. The insulation used in conjuction with EPDM is a black faced high density Isocyanurate. The stuff you are showing does not cut it. It has poor compressive strength, and the facer is not bonded well enough for roofing.

You are going to need a bunch of stuff. Pressure sensitive flashing, primer, phenolic core rollers etc.

I would not use less than .060 Unreinforced EPDM (Ethelyene Propylene Diene Monomer) It is actually a Terpolymer, not a Monomer any more since about 1986 I think. The reason for the thicker membrane is its "hand" .060 is much easier to seam than .045. you may want to do a search on my previous posts re EPDM. Use fully Adhered, and use unreinforced.

A pond liner does not have to put up with anywhere near the grief that a roof puts up with, so I would stick with roofing material. It might be the same formula, but frankly, I don't know

If you think you want to do this yourself, you need to read up. It might be wise to just hire a commercial roofer. If you decide to do it yourself I would look up a commercial single ply contractor and see what they have in the shed, because a roofing supply is going to charge you retail.
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Last edited by jagans; 04-15-2013 at 05:31 PM.
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