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Old 02-11-2016, 12:07 PM   #51 (permalink)
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If the air space between the insulation and the bottom of the sub floor isn't going to be vented somehow then you can create issues with moisture. Since your trying to insulate the floor system you don't want to vent that space to the crawler, so you would have to make it "interior" conditioned space and have floor vents etc.

In short, push the insulation up against the bottom of the subfloor.

That is at least the Colorado version of what you need to do.
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Old 02-11-2016, 12:12 PM   #52 (permalink)
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Quote:
Originally Posted by miniwally View Post
If the air space between the insulation and the bottom of the sub floor isn't going to be vented somehow then you can create issues with moisture. Since your trying to insulate the floor system you don't want to vent that space to the crawler, so you would have to make it "interior" conditioned space and have floor vents etc.

In short, push the insulation up against the bottom of the subfloor.

That is at least the Colorado version of what you need to do.
Ok, I agree with you 100% on that part. How do I make it stay there? I've got 2x10 joists and insulation that's 7 1/4" thick... how do I make up the gap and keep it from falling out without spending a ton of time or money?
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Old 02-11-2016, 12:16 PM   #53 (permalink)
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Quote:
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Why not stuff the old insulation in the gap and put up foam? That foam board seems to go up pretty easily.
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How do you secure the foam once it's between the joists? That still leaves me buying ~650 - 700 sq foot of insulation for the rest of the floor too.
The board is not the best in my opinion. You have the handling issues, then you have to tape it to seal it, and on top of that, to get the same r value as sprayed foam, you have to buy just as much. If you want 1" board over fiberglass; that's probably good to block airflow and such, but getting any R value out of it is more trouble and same price than just spraying it.
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Old 02-11-2016, 12:17 PM   #54 (permalink)
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Quote:
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Ok, I agree with you 100% on that part. How do I make it stay there? I've got 2x10 joists and insulation that's 7 1/4" thick... how do I make up the gap and keep it from falling out without spending a ton of time or money?
thousands of those little metal spikes
staples on the facing (if any)
spray cheap open cell foam on it, basically using the open cell foam like a glue
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Old 02-11-2016, 12:30 PM   #55 (permalink)
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The board is not the best in my opinion. You have the handling issues, then you have to tape it to seal it, and on top of that, to get the same r value as sprayed foam, you have to buy just as much. If you want 1" board over fiberglass; that's probably good to block airflow and such, but getting any R value out of it is more trouble and same price than just spraying it.
Jesus F'n Christ, I'm talking about R30 ComfortBatt from Roxul which is stone wool, not board. I want to get away from Fiberglass, it's a PITA to work with and it falls apart. I'm not doing spray foam, I want/need to be able to get to my utilities under my floor because the people who built my house were horrible electricians and I don't want to have to dig wiring out of foam every 6 months to fix something.
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Old 02-11-2016, 12:34 PM   #56 (permalink)
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Jesus F'n Christ, I'm talking about R30 ComfortBatt from Roxul which is stone wool, not board. I want to get away from Fiberglass, it's a PITA to work with and it falls apart. I'm not doing spray foam, I want/need to be able to get to my utilities under my floor because the people who built my house were horrible electricians and I don't want to have to dig wiring out of foam every 6 months to fix something.
That's why I said either use the little spikes or use cheap open foam like glue, not a complete cover.
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Old 02-11-2016, 12:34 PM   #57 (permalink)
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Watch this video.

https://www.youtube.com/watch?v=zd9RKeTrdXI

My concern is that my 2 x 10 joists are deeper than the 7 1/4" batts.
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Old 02-11-2016, 01:55 PM   #58 (permalink)
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Quote:
Originally Posted by Soundguy View Post
Watch this video.

https://www.youtube.com/watch?v=zd9RKeTrdXI

My concern is that my 2 x 10 joists are deeper than the 7 1/4" batts.
shove it up to the floor. WHat's the concern?
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Old 02-11-2016, 02:31 PM   #59 (permalink)
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How do you secure the foam once it's between the joists? That still leaves me buying ~650 - 700 sq foot of insulation for the rest of the floor too.
You don't fit the foam board between. You butt them together and screw them into the joists. Then you tape the seams. I'm sure that Amanda and I could arrange to meetup down there and help out one weekend.
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Old 02-11-2016, 02:33 PM   #60 (permalink)
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Watch this video.

https://www.youtube.com/watch?v=zd9RKeTrdXI

My concern is that my 2 x 10 joists are deeper than the 7 1/4" batts.
Just use 2 layers of r23 5.5. BTWI love roxul products 10x easier to use than fiberglass
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Old 02-11-2016, 02:46 PM   #61 (permalink)
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You don't fit the foam board between. You butt them together and screw them into the joists. Then you tape the seams. I'm sure that Amanda and I could arrange to meetup down there and help out one weekend.
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Just use 2 layers of r23 5.5. BTWI love roxul products 10x easier to use than fiberglass
Oh, how convenient is that? I mention Amanda and Bondage shows up.
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Old 02-11-2016, 02:49 PM   #62 (permalink)
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There are little wires that hold the batts of insulation.
Shop insulation supports at Lowes.com: Search Results!
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Old 02-11-2016, 02:50 PM   #63 (permalink)
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Just use 2 layers of r23 5.5. BTWI love roxul products 10x easier to use than fiberglass
I'm in temp zone 2, I'm already way overkill by going with a single layer of the R30.
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Old 02-11-2016, 03:03 PM   #64 (permalink)
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Oh, how convenient is that? I mention Amanda and Bondage shows up.
Bwahahahahaha....

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Old 02-11-2016, 03:09 PM   #65 (permalink)
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Oh, how convenient is that? I mention Amanda and Bondage shows up.
You crazy.
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