What Material to Use Over Asphalt Step Out Roof Area

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Old 01-21-14, 12:12 PM
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What Material to Use Over Asphalt Step Out Roof Area

I would like to apply new material over an old ashpalt (tar and gravel) roof area before installing a 2" x 6" wood deck for standing/walking. The area is only about 50 square feet. It slopes torward a roof drain positioned at an inside corner. In the same corner, two cast iron drain stacks penetrate the roof.

I don't know how many times the area was roofed with asphalt, but I would very much prefer not stripping the area down to the wood roof deck. In particular, I'd like to avoid disturbing the seal that's been achieved around the drain inlet. I have already purchased retrofit rubber boot flashings to install around the two drain pipes once I instal the new membrane.

EPDM is available locally, but I understand I need a barrier of some sort between the old asphalt and the new membrane. Is there a separator sheet or other flexible underlayment that will work with my inwardly sloped roof area?

If not EPDM, is there some other material that I can install directly over the old asphalt roof (once all the gravel is removed) that is relatively flexible to work with and that will not fail prematurely if I lay a wood deck on top of it? The wood deck won't weigh much, and it will be rare that more than one person stands on it. Will mineral surface roll roofing stand up just fine? It would certainly be more "user friendly" with the existing asphalt substrate.

Thanks!!
 

Last edited by Riddler; 01-21-14 at 02:12 PM.
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Old 01-21-14, 12:55 PM
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Can you post a pic? I'm wondering about the added weight, from the 2x6s & whatever else that you install.
 
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Old 01-21-14, 02:11 PM
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Never tried to post a pic. How do I do that?

I was sloppy in my descripton of wood walking surface. Actually, the previous surface, which I am inclined to duplicate, had three 2" x 6"s laid flat for supports and 1" x 4"s attached perpendicular across the top for the surface. Not a heavy assemply really (one person could easily lift it on its side).

The only stress/wear on the roof membrane will be where the supports for walking surface lay on the membrane. Given the small area (i.e., 5' x 9'), three 2" x 6"s laid flat would distribute the weight of the walking surface and any person above rather well, I would think.

So do you think a run-of-the-mill fiberglass reinforced mineral surface roll roofing material will do the trick? Or do I really need to consider something more exotic?
 
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Old 01-21-14, 03:03 PM
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If you can't post a pic here, use photobucket.com
 
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Old 01-21-14, 03:45 PM
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Actually you can post pictures here directly from your computer. Don't use attach though. Use embed in the advanced editor. http://www.doityourself.com/forum/el...-pictures.html
 
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