Any suggestions for correctly installing wood planks in attic without screwing up the insulation?
Question:I just added a pull down ladder to my attic. Now I want to add wood surfaces over the joists. Will sandwiching the insulation between the drywall and new surface have an adverse effect on the insulation value?
Answers:
If your insulation is over the joists, compression will reduce the R value. If it is only slightly above the joist, don't sweat it, as mentioned the planks will add some minimal value and slight compression won't reduce the R value significantly. If you are in a northern climate and the insulation is several inches above, you need to figure out how to raise your floor so it just rests at the height of the insulation. Might have to add 2 x 4 or 2 x6 on top of the joists, and of course attach them, then add your floor. Also make sure you don't inadvertantly cover over any exhaust fans that are not vented to the outside, or any "can lights" than can overheat if covered.
No it wont, but sheet materials would be better. you may get cracks in the ceilings below and could ( if it is very thick ) push the insulation through the ceiling boards. be careful!
It does, but if you are laying ply wood down for storage, The plywood will act as a sealer and you will still have a good R- value rating. This will be like your exterior walls only horizontal.
As long as you are not compressing the insulation, there should be no problem. Insulation works by having captive air so if you compress it, you are lowering the R-value.
I agree with sensible_man. Also make sure that if the insulation has backing material on one side (i.e. paper, foil) that this side is facing down towards the rooms below. If you compress the insulation too much you will not only lose R value but risk buckling the sheetrock on the ceilings of the rooms below (assuming they have sheetrock).
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