Question about Insulation

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ParishM
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Question about Insulation

Post by ParishM »

bought a few bags of attic insulation and it says it's 10.25" thick on the bag but each piece was only about 3-4" thick. will this expand over time ? Image

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Iosef
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Post by Iosef »

Check to make sure the kraft paper unfolded all the way on the sides. You might have to help it finish expanding. At 4 inches, it's only R-17. It has to expand to 8 inches at least, to reach the R-30 value.
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Tenzing_Norgay
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Post by Tenzing_Norgay »

That's the thickness when manufactured, before they vacu-pack it into those rolls for shipping.

It will expand some, but not to 10". I would only be concerned about the R-value and not so much the advertised thickness. R-38 is recommended for FL attics.

Contact the manufacturer. I know Owens-Corning is very responsive to questions.
Last edited by Tenzing_Norgay on Mon Jul 06, 2020 12:15 am, edited 1 time in total.
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Firemedic2000
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Post by Firemedic2000 »

Does insulation wear out. I know sounds dumb. But is there an expiration date. Say for instance, fiberglass insulation does the heat break it down over time. God I hope not
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Tenzing_Norgay
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Post by Tenzing_Norgay »

Firemedic2000 wrote: Sun Jul 05, 2020 10:46 pm Does insulation wear out. I know sounds dumb. But is there an expiration date. Say for instance, fiberglass insulation does the heat break it down over time. God I hope not
It doesn't "wear out" so to speak, but if it gets compressed/settles/wets over time it becomes less effective. Measuring will give you an idea where you're at.

After removing POUNDS of rat/racoon turds when demo'ing our old ceiling & insulation, we decided to go with open cell spray foam. Rats can't poop up. :lol:

Image
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Firemedic2000
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Post by Firemedic2000 »

Tenzing_Norgay wrote: Mon Jul 06, 2020 12:14 am
Firemedic2000 wrote: Sun Jul 05, 2020 10:46 pm Does insulation wear out. I know sounds dumb. But is there an expiration date. Say for instance, fiberglass insulation does the heat break it down over time. God I hope not
It doesn't "wear out" so to speak, but if it gets compressed/settles/wets over time it becomes less effective. Measuring will give you an idea where you're at.

After removing POUNDS of rat/racoon turds when demo'ing our old ceiling & insulation, we decided to go with open cell spray foam. Rats can't poop up. :lol:

Image
Man that looks really nice
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