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Old 11-21-2011, 11:14 AM   #1
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Contractor blowing cellulose in, says don't need plugs


1948 house, wood siding with aluminum over the top of that. Interior is drywall. I hired a company to remove the aluminum siding, drill a 2" hole and blow in cellulose. I was surprised to see they are not plugging the hole at all, just leaving it open and putting the aluminum siding back on.

Should they be using wall plugs? I would think there is going to be air penetration or water penetration.

Thanks!

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Old 11-21-2011, 11:28 AM   #2
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Contractor blowing cellulose in, says don't need plugs


Dense packed cellulose is its own air barrier.

Is your new siding going to incorporate some sort of rigid foam or housewrap? That should seal off that hole.

You have a great opportunity to improve the overall R-Value of the entire wall with rigid foam.

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Old 11-21-2011, 11:31 AM   #3
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Contractor blowing cellulose in, says don't need plugs


I am not installing new siding. They are taking one row of siding off, drilling, filling and putting the same aluminum siding back on.

What I am concerned with is that there is going to be bug, air or water penetration through a huge 2" hole in each stud all the way around my house. I have always seen contractors use plugs.
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