Reinsulating the Attic

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biddlecom

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I plan on reinsulating my attic. I will be taking all the old fiber glass insulation out and replacing it with Roxul. I will put a layer of R30 then a layer of R15 on top of that. When all the old insulation is out I plan on cleaning the attic because of mice and things of that nature. Is there a sealant, disinfectant, or protection I should use before reinsulating? Also, should I just put the R15 on top of the R30 or should there be something in between the layers?
 
Nothing between the batts but while you have it open seal the holes that are drilled for wires and such, there is a special sealer for that, check for adequate venting.
 
nothing between the layers and lay them across the first layer instead of in the same direction.
 
Wouldn't need to do some type of sanitizer for mice pee and poop?
 
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