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Home insulation ??

Old 12-14-2011, 04:35 PM
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Default Home insulation ??

I have a chance to buy a lot of 6 1/2" R19 batt insulation at a steal of a price, and would use it to finish out an addition to one of my rental properties. Here's the question/problem.

The walls are studded with 2x4 lumber, so.................if I stuff 6.5" batt into the space and cover it with 1/2" sheetrock, is there any way that it won't bow out? Oh, , studs are 24" OC.

Alternatively, is there a quick way to slice a few inches off those batts? The stuff is so cheap that I could easily pay somebody to do the work If I have a plan.

Anybody BTDT?
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Old 12-14-2011, 05:06 PM
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I bought the wrong stuff one time and stuffed it in.it's not that hard to peele some off if need be.I just did that to put some in a block wall with fering strips.
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Old 12-14-2011, 05:13 PM
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Will not get the R value if you compress it .
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Old 12-14-2011, 05:14 PM
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Yeah, it will bow. It can be done. Its easy to peel of two inches of insulation off of each batt, I wouldnt do it for a whole house or anything.Yould have to use metal instulation rods to hold it in the bay while you rip the finishing peice in the stud bay. Pain the butt, but if you are getting it for almost free it might be worth it depending on how much u got to do.
Make sure you get an estimate from a insulation guy. My guy installs it at cheaper than I can buy it at Home Depot, for example.
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Old 12-14-2011, 06:50 PM
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Down here in the deep south, R value isn't as important as a structure being made to be wind and termite resistant. I'll have to find a kid that REALLY needs the money to peal a few inches off about 60 strips. I'll toss all that extra over the attic insulation.

The tough part is that I'll be buying a good bit more than I need on this project, so wish me luck with craigslist.
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Old 12-14-2011, 07:20 PM
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peel a layer or two off and stick it in there, wont take but a minute to do..
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Old 12-15-2011, 02:24 PM
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Originally Posted by bamaboy473 View Post
Down here in the deep south, R value isn't as important as a structure being made to be wind and termite resistant.
You all don't have AC down there?
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Old 12-16-2011, 05:44 AM
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Is your insulation faced or unfaced?
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Old 12-16-2011, 05:49 AM
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Bama
I have installed a million ft of insulation and I have used 6"
insulation in a 3 1/2 " wall a few times and never seen the drywall bow
if its properly screwed off.You can get some insulation wire surports at lowes
that will help keep it compress in the wall btw
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Old 12-16-2011, 06:33 AM
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I wouldn't have built a wall with 2X4's @ 24" OC in the first place, does that meet the wind code? Also, the insulation won't pass code.

If the room got damp (AC off), compressed insulation will bow the sheet rock, especially at 24" OC.
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Old 12-16-2011, 06:39 AM
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Originally Posted by davedowneast View Post
I wouldn't have built a wall with 2X4's @ 24" OC in the first place, does that meet the wind code? Also, the insulation won't pass code.

If the room got damp (AC off), compressed insulation will bow the sheet rock, especially at 24" OC.
Whoever build the workshop did what he did; and to make matters worse, the studs don't all stand on 8' centers, making sheetrocking a very labor-intensive job. I'll probably scab 2x4s as needed to avoid trimming the sheetrock.

I'm going up there today to unload the trailer (8x14x7 full to the door) of ceiling tiles and insulation. By noon I'll know how easy it is to thin the batts to fit the studs, because I tend to agree with davedowneast that 2' centers will eventually give the walls 2" THT swells
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Old 12-16-2011, 06:57 AM
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What about this?:

Install the 6" into the cavity as normal.

Slide those stiff wire retainers behind the paper, thru the insulation to hold everything in the cavity.

Then peel the excess insulation off or fashion a tool to help slice it off.

I'm assuming it's faced.
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Old 12-16-2011, 07:06 AM
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...if I'm reading your suggestion correctly, the facing would be removed and I'd like to retain as much moisture barrier as possible.

Hopefully just pulling will get a section off the batt. The only item I could think of for cutting it would be an electric carving knife...but the admiral said, "NO".
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Old 12-16-2011, 07:19 AM
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Originally Posted by bamaboy473 View Post
...if I'm reading your suggestion correctly, the facing would be removed and I'd like to retain as much moisture barrier as possible.

Hopefully just pulling will get a section off the batt. The only item I could think of for cutting it would be an electric carving knife...but the admiral said, "NO".
Right, the facing would be peeled off...but my experience is slicing off thickness is a lot easier when the batt is held stable and flat.

You could then staple up plastic sheet as vapor barrier or lock down one end of old facing on the floor and remove insulation from the original facing and the staple up original facing.

I'm thinking a wide, thin piece of plastic or metal to use as a giant razor.

This way you can control depth of removed insulation.

Have lots of new razor knife refills and compress insulation with a board as you cut batts to length.

Have fun.
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Old 12-16-2011, 07:25 AM
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If you stuff it in, doesn't it defeat the purpose of insulation design of trapping air?
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Old 12-16-2011, 07:45 AM
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Sell the 6" at a profit and buy the correct insulation. You are making WAY more work for yourself than it's worth! How much could you possibly be saving? I think you have way to much time or your hands, go do something productive.

Personally, I'd hire an insulation company that probably will do it cheaper than the cost of materials and I'd do something else.

Rick, seriously, messing with this is ill advised! Bad idea from the beginning!
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