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Cold Room insulation

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Posted by: from Newcastle
3/9/2020 at 12:36:00 PM

I want to insulate my cold room in the basement under my front porch. It has a vent outside and an exterior door. I've already tried to seal it up, but ended up having a ton of condensation on the ceiling, I don't think I had it sealed up well enough. I want to use the room for storage. Before in the winter everything would freeze and in the summer was super musty and humid. I've torn everything out and want to do it proper. I've filled the vent hole with spray foam and removed the exterior door. I was thinking of using 1.5 durafoam insulation board on the ceiling and the exterior walls. PL it to the concrete, seal all the seams with elastic caulking, and blue vapour tape, and make the area complete sealed so no warm air from the basement meets the cold concrete walls. Or am I totally off??

Thanks for the help.
Cold Room insulation
Cold Room insulation
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REPLIES (3)
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Scott from Northern Foam Tech Ltd in York
Date/Time3/9/2020 at 3:06:53 PM

No your not far off at all I would use the blue SM board try to get the inch and a half min make sure vent holes are sealed tight then do the ceiling first I personally would double up the ceiling then your walls and make sure all joints are tuct taped (blue tuct tape) going all the way down to the floor and you should be good to go.

Thanks.

Scott

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Jeff from All-In Renovations in Calgary
Date/Time3/9/2020 at 3:33:29 PM

I personally would frame a 2 x 4 wall in front of the concrete foundation wall and leave a 1in space between the back of the wall and the concrete wall. Then insulate the wall maintaining the one in air space behind it. Then install a 6 mil vapour barrier. For the ceiling I would insulate with safe and sound batt insulation

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Ian from Derksen Home Services in Edmonton
Date/Time3/10/2020 at 8:35:25 PM

It sounds like your thought is to have the rigid foam insulation exposed on the ceiling; unfortunately that's not permitted by Code. It would require regular 1/2" drywall overtop. Also any interior finishes are required to have a maximum flame spread rating of 150 in the event you were to consider other alternatives such as plywood.

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