03:03AM | 02/06/06
Member Since: 03/01/05
28 lifetime posts

We have a finished basement and part of it runs underneath our garage.

The garage floor appears to have been poored on top of corrugated metal on top of steel girders.

Below that is insulation, plastic, and drywall.

I've noticed that the corrugated metal sheet has begun to rust in spots (due to condensation - even though its cold out) and has even gotten into the drywall causing it to bubble in spots.

What can I do to either stop the condensation or keep it from dripping down? (I presume the former is the only good solution)

I don't see any way to vent it to the outside.

Thanks in advance for any assistance you can offer.



05:00AM | 02/06/06
Member Since: 04/25/05
1915 lifetime posts
The only way that I know of to stop this is to prevent the realatively warm/moist interior air from reaching the cold metal.

That requires sealing off ALL air movement from the interior and also insulation to keep the surface that the air does "see" warm above the dew point.

The best, but most expensive option would be to tear it all out and have it spread with foam.

It might be possible to install sheet foam (again after tearing out the existing) and then using canned foam to seal all of the edges and joist. but you need to be very detailed so taht there is no way that air can get behind it.

In either case then you would cover it with drywall.


05:12AM | 02/06/06
Member Since: 03/01/05
28 lifetime posts
I wonder if I could have insulated an opening from a storage room (where there was no drywall). That could have let air into it. Thanks.



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