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Old 02-16-2012, 11:17 AM  
Dalmus
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Default Insulating Plaster Walls

Hey everyone,

I have a cape cod in Wisconsin built in 1947. Block walls with a brick veneer from the basement to the rafters.

The walls are cold all winter long, and I finally decided that I really need to do something about it as the house quickly cools after the furnace shuts down. Having a concrete floor under the carpeting doesn't help matters!

I made a couple of exploratory holes, found that I have no insulation (not a surprise given the year) in the exterior walls.

I would love to blow in some insulation, however, being plaster walls from 1947, there is no vapor barrier.

With Wisconsin being a rather humid area, I assume anything I blow in would potentially become a mold trap rather quickly.

Is there anything I can do, short of ripping down the plaster walls, insulating, and replacing with drywall?

Thanks for any ideas!



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Old 02-16-2012, 01:50 PM  
nealtw
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Your old walls have oil base paint on them which has a pretty good rating for vapour bearier and there are paints on the market that will do that too.



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Old 02-16-2012, 02:49 PM  
Dalmus
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Originally Posted by nealtw View Post
Your old walls have oil base paint on them which has a pretty good rating for vapour bearier and there are paints on the market that will do that too.
That's a good point that I never really considered - Paint-on barriers.

I'll have to do some research and check permeability ratings... But do you have any suggestions? I would think any of the paints meant to trap odors and such (such as KILZ or BIN) would have to be very low perm?
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Old 02-16-2012, 04:27 PM  
inspectorD
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Look for an insulation that can work in the walls.
I use this product for our remodeling jobs, it seals the air, and disipates any vapor over time. www.nationalfiber.com
I use it instead of spray foam, and it is easy to drill holes to install.

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Old 02-16-2012, 04:33 PM  
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http://www.icynene.com/assets/docume...eSuperSpec.pdf
I suspect all the major companys will have something.
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Old 02-29-2012, 08:36 PM  
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I'd go with the cellulose as it doesn't require a vapor barrier and will fire-stop between floors as well as wick moisture to disperse. http://www.applegateinsulation.com/C...id=249418&fd=0
Secondary reason for no vapor barrier paint or otherwise: http://www.greenbuildingadvisor.com/...moisture-walls

Gary



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