Ceiling/Deck insulation


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Old 09-04-21, 11:06 PM
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Unhappy Ceiling/Deck insulation

this is the ceiling of my bedroom, it's the upstairs neighbors balcony. has leaked for years, being replaced now.

We are 7000ft in Utah, gets to 0F here in Winter.

they will use 2x8 joists, may be hard to find 7.5" insulation. I would like to insulate as well as possible since this room is coldest in the home.

about 8'x12' space.




thank you for any help.



 
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Old 09-05-21, 04:06 AM
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I cant even imagine what construction/decking/sealing would be used for a situation like that which must be why it's been leaking for all these years, not to mention the noise of someone walking around on the deck.

Foam would be the best but might be cost ineffective for just a small area. Blown in cellulose would be next option followed by batts.
 
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Old 09-06-21, 10:08 AM
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Is it okay to just put 2-layers of R19 to fill most of the 7.5" space?
 
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Old 09-06-21, 10:16 AM
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If you did that you would use one layer of R19 and one layer of R11 so that its not overly compressed. You lose replies value when you compress insulation.

The bigger concern is how that deck is going to be waterproofed! That's got to be someone's retarded idea of a bonus room. (Should never have been done)
 
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Old 09-06-21, 01:41 PM
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what about spray foam?

https://www.homedepot.com/p/Touch-n-...2200/204962748

at this point would be willing to pay to have if sprayed/sealed with foam or whatever is best.
 
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Old 09-06-21, 01:45 PM
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Add it all up, those kits are for like the picture shows doing your joists, not for insulating an entire wall/ceiling!
 
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Old 09-06-21, 02:00 PM
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To fill 7 1/2 inches deep you will need 4 packages of the spray foam costing roughly $1500. Are you the one responsible to insulate or is it a shared cost thing with the neighbor?
 
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Old 09-06-21, 03:57 PM
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does it need to be filled? says this:

"Covers 200 sq. ft. at 1 in. thick and R-value is 6.2 at 1 in. thick?

so, 2" foam and R19 over it?

I am paying!


 
 

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