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Old 09-27-2010, 03:59 PM   #16
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Best way to replace/insulate a flat tar-gravel roof


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Thanks Federer, but I am bit confused, for my roof, I don't have an attic, my roof is pretty much flat, with 8" rafters.
thats how mine is too. basically with us there is not enough attic space for regular insulation, because we can only fit like 5in of fiberglass or whatever. so for us spray foam works better because what they do is spray it right to the decking so it seals the roof off completely from the fake attic, so to speak. just be sure you do open cell in case roof leaks you can tell. do you have drywall for your ceilings?

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Old 09-30-2010, 01:18 PM   #17
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Best way to replace/insulate a flat tar-gravel roof


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Originally Posted by federer View Post
thats how mine is too. basically with us there is not enough attic space for regular insulation, because we can only fit like 5in of fiberglass or whatever. so for us spray foam works better because what they do is spray it right to the decking so it seals the roof off completely from the fake attic, so to speak. just be sure you do open cell in case roof leaks you can tell. do you have drywall for your ceilings?
I have drywall for my ceilings, that is the one reason I don't want to insulate from within the house -- if I do that, I will have to put another sheets of ceiling drywalls.

What do you mean "do open cell" in your reply "just be sure you do open cell in case roof leaks you can tell"?

Thanks again!

Oh, if you don't mind, could you tell me how much, roughly of course, that spray foam your house would cost? I assume you will have the tar-n-garvel removed, roof plywood removed, spray foam, install new plywood and new roof materials?
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Old 09-30-2010, 11:57 PM   #18
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Best way to replace/insulate a flat tar-gravel roof


yea with your case spray foam is probably best. because they can just spray right down to the attic floor on top of the ceiling and it will expand against the drywall. open cell refers to the spray foam used. there are 2 types. open means its permeable, so if roof leaks you can tell. for my house the first estimate is at least 5k
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Old 10-06-2010, 02:14 PM   #19
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Best way to replace/insulate a flat tar-gravel roof


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Originally Posted by federer View Post
yea with your case spray foam is probably best. because they can just spray right down to the attic floor on top of the ceiling and it will expand against the drywall. open cell refers to the spray foam used. there are 2 types. open means its permeable, so if roof leaks you can tell. for my house the first estimate is at least 5k
Thanks Federer for the valuable information!
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Old 10-08-2010, 01:17 AM   #20
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Best way to replace/insulate a flat tar-gravel roof


i got a better estimate-3k only.

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