Attic Floor and mashing insulation
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).
Anyone have any input on this?
Feel free to call me crazy. I do it myself sometimes!
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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