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jeffeddy

06:15AM | 12/15/03
Member Since: 12/08/03
3 lifetime posts
Bvbasement
I have blown insulation in the attic of my 4 yr old house. I have some plywood down in the middle of the attic for storage, but would like to add more. Is there a concern about pressing down the insulation towards the middle of the attic. What should be my thought process??

Thanks

k2

08:44AM | 12/15/03
Member Since: 06/06/03
1250 lifetime posts
I'm not an insulation pro by any means, but I'd be worried about 2 things:

1. That compressing the insulation will decrease its usefulness (R-value). It needs "loft" (thickness) to do its duty.

2. Push the insulation down enough, and I'd be afraid of pushing down the drywall (ceiling).

-k2.

devildog

07:35AM | 12/22/03
Member Since: 09/16/02
251 lifetime posts
I'm an expert in nothing, but I agree with K2 and I have heard most attics are not meant for storage. While it is something our parents did and most of us have probably done it's probably not something builders would recommend. Unless you're one of the few who thought about this while building the house and put joists in that are strong enough.

Anyone have any input on this?

Feel free to call me crazy. I do it myself sometimes!

Good luck
Devildog

Piffin

01:02PM | 12/27/03
Member Since: 11/06/02
1284 lifetime posts
Both replies are correct.
If the normal lofted R-value is 3.5/inch and you compress the insulation from 8" to 4", you will have less insulation value than a normal 4" loft will provide because you will hjave solid material where the encapsulated air is supposed to be resuisting heat loss and it can conduct heat away faster.
If the framing was on;y intended for the ceiling load, and you add the weight of a lot of ply wood plus the stored items, you could find the ceilings sagging and showing cracks in the drywall or plaster. This will be more exaggereated in the center than near the perimeter
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