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Studio64

09:58PM | 07/11/04
Member Since: 07/11/04
1 lifetime posts
Bvhvac
I'm putting together a music practice room in my basement and I just hung insulation (R-19 type) on a wall made of concrete block. Because I wanted more width in the room, I had the carpenter install the 2 x 4's flat (with 2" depth). After securing the insulation I hung a few panels of drywall (1/2" thick) over it (very tough to compress the thick insulation behind the drywall).

My questions are these:

Did I use the wrong type of insulation?

If I leave the R-19 in place, do I chance having a mold situation in the future?

A friend of mine basically told me that R-19 type of insulation was a NO-NO when it comes to concrete block walls and could cause mold to form because of lack of breathing room.

HELP..Please!

Thanks,

NJ

dgalenski

06:18AM | 07/14/04
Member Since: 01/02/03
31 lifetime posts
I believe that you need a vapor barrier (plastic) over the concrete to keep the moisture away from the insulation. Also r-19 insulation is made to fit in a 2X4 wall when the 2X4's are run long ways. Compressing insulation bows out the drywall and actually decreases R value.

Piffin

05:58PM | 07/25/04
Member Since: 11/06/02
1284 lifetime posts
R-19 is made to fit in a 2x6 wall, not 2x4, but you are right about it losing insulative value as it gets compressed. Soince the R-value of fibregals bats is in the neighborhood of R-34.2 pewr inch, and this is compressed to one and a half inches, the best expectation would be R 4.8, but because of the over-compression, it is probably not worth more than R4

There is a potential for mold, depending on the humidity level and how well waterproofed the concrete is, but hard to test that since itis already coverd up.

Excellence is its own reward!


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