no vapor barrier


Old 04-23-05, 07:19 PM
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no vapor barrier

I have recently purchased a 22 year old 2160sq/ft bungalow with a basement, and have come to find there is no vapor barrier in the walls or ceiling. The outside of the house was never finished with siding, is there any way to seal my house up with out having to tear apart the inside? I am scared that when I seal the outside of the house and side it there will be condensation in the walls and eventually they it may mold or rot. temperatures get as cold as -40C in winter. do you see any options for me?
I think the reason nothing has rotted out so far is that with only plywood on the exterior, the house has been able to some what breath. also the insides of the exterior walls are sheeted with 1x8 boards with 0.25 plywood and then panaling.

Last edited by rob1; 04-23-05 at 07:29 PM.
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Old 04-29-05, 04:42 PM
Join Date: Jan 2005
Posts: 197
vapor barrier

The lack of vapor barrier on the inside of the walls shouldn't be regarded

with too much concern. It's a good idea to have it, but I wouldn't do

anything destructive to put it in there. Unless your house has some unusual

source of moisture, like a wet basement, damp crawlspace, indoor pool or

hot tub or cultivating ''pot'', you shouldn't have a moisture problem inside

the walls due to normal circumstances. Moisture problems inside walls are

usually the result of condensation. Condensation is the result of normal

amounts of humidity turning into water ( condensing ) as a result of a

temperature differential. To reduce the temp. differential inside the walls,

I would use a 1/2'' poly styrene board under the new siding your planning on.

The business of moisture getting trapped inside walls from normal interior

humidity is way overblown. You need to reduce the temperature differential

and you shouldn't have any problems. By the way, how cold is -40 C ? You

must live in Canada, we pretty much decided the old method was best in

the ''states'', thankfully, because I'm too old to relearn everthing. Best of

luck on your project.

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