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demandrew 02-27-2012 08:24 PM

How to correctly insulate with bats
Can anyone help me out here or am I opening up a big can of worms?

I had hoped that my questions would produce straightforward answers, but it seems that the more I've been asking around the more varied the responses I've been getting.

Is it possible that there is so such thing as the "correct" way?

I want to install bat insulation in two exterior walls. They are brick.

Some people told me I should leave a small air gap between the insulation and the brick, but their reasoning for this varied. Generally, they felt that an air gap would prevent moist air from becoming trapped and causing damage..

Some other people told me that this is no longer the case with newer and more moisture resistant insulation and that you should be filling the cavity as full as you can with no air gap. Although, one man did comment that a lot of contractors still don't believe this and still maintain the old way..

So who to believe?? One guy today told me to put a moisture barrier down on the brick, then my insulation, then a second moisture barrier on the interior! This doesn't sound right either, because countless other people have told me that you only put a vapor barrier on the inside and to have them on both sides would prevent moist air from escaping outside and thus damage the insulation.

So what's the deal? I'm having a very difficult time sorting through all the differing opinions that I'm receiving but this is the first time I'm doing this and want to make it "right". Maybe there is no right way and everyone just has different opinions? Maybe there's just a lot of people who don't really know what they're talking about but pretend that they do?

can any of the pros out there set me straight?

Gary in WA 02-27-2012 11:03 PM

Some choice reading for you:

From the Feds:


And the one you've been waiting for:


Windows on Wash 02-28-2012 07:09 AM

You need and air gap so that the brick can dry out.

It should be a vented wall and your insulation layer on the interior side of the brick should be air impermeable.

The rest of the recommendations depends on where you live.

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