Unusual use for Durofoam


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Old 09-08-14, 05:31 AM
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Unusual use for Durofoam

O.k I'm aware that I might be breaking all kinds of city building codes, but codes can't help me for this coming up cold winter.

I have an attic portion of my roof that is not enough space to get to I'd have to access from taking down a portion of my living room ceiling. I can't do this cause I don't have the money to remove possible asbestos insulation.

The ceiling has not enough insulation so for now I put durofoam up on ceiling r-3.71 value. You think this ok for now to help a little?
 
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Old 09-08-14, 01:43 PM
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Why can't you cut a scuttle hole in a closet in the inaccessible area? That way, you could insulate the area to a comfortable rate. If you don't have the money to remove insulation (and I doubt it contains asbestos), you won't have money to install 2" thick foam Check on the scuttle hole thingy and let us know.
 
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Old 09-08-14, 01:49 PM
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The foam cost $70. It is such a small space I'd have spray foam and even that no guarantee get all the area. And plus it would need valleys if I spray foam in there for air to get to rest of attic.
 
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Old 09-08-14, 01:53 PM
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I've already had insulation tested and confirmed asbestos in other areas of the house. So it's actually very likely it might have.
 
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Old 09-08-14, 02:09 PM
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Most rigid foam board requires a minimum of 1/2 inch gypsum drywall covering it on the side of living spaces for a fire retardant.
 
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Old 09-08-14, 03:05 PM
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I have no problem covering it with drywall but how would I? I was doing it as a temporary patch for winter. If covered with drywall how does it get vapour barrier ?
 
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Old 09-08-14, 03:28 PM
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The foam is a vapor barrier. You just have to protect its surface, and the best way to do it is via sheetrock. You'll have to use screws long enough to penetrate both layers of sheetrock and the foam, and extend into your joists by half the length. For instance, 2 layers of sheetrock at 1/2" each and 2" foam would equal 3", so you would need 4" screws, which would become impractical.
 
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Old 09-08-14, 03:40 PM
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It's 1" foam. Put 1/2 drywall so 2" practical right
 
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Old 09-08-14, 05:18 PM
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I might just put ceiling tile up instead of drywall
 
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Old 09-09-14, 02:54 AM
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3" screws. Two layers of sheetrock and one layer of foam = 2". You will need half again that much into framing, so 3". What type of ceiling tile, and how would you attach them?
 
 

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