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Old 09-13-2010, 08:03 PM   #1
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Blowing in sidewall insulation with thin batts in there


on my present project(old siding removed,previous to typar and vinyl siding) I was going to blow the sidewalls with cellulose or fiberglass thru the 3/4 sheathing on outside walls.

come to find 2 " batts of mineral wool in there. Can I still blow 'some' in there or is that causing more harm than good? would you 'aim' for the outside of the present batt or inside?

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Old 09-15-2010, 06:31 AM   #2
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Blowing in sidewall insulation with thin batts in there


anyone have a guess?

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Old 09-15-2010, 06:19 PM   #3
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Blowing in sidewall insulation with thin batts in there


Very hard to get any kind of quality with them in there. If they rip and drop while filling, even worse. Compressing the existing will negate it and adding another won't give you the R-value as if it wasn't there. If the old is faced, it should be to the warm in winter side if in a cold climate. Using dense-pack cellulose may work better, if done by a professional.....

Gary
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