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Old 01-21-2011, 10:19 AM   #1
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rigid insulation in basement

Hi. I rent a +50 year old home with cinder block exposed foundation in my basement. I want to insulate my laundry room 'cause it's really cold down there right now, and the bathroom above is cold as well. I don't have much space, everything is right up against the walls with only a narrow space to be able to open the dryer door. What's the minimum thickness of rigid foam I could use, and not make it a complete waste of $ investment? Also can I leave the rigid foam just exposed after? I'm not interested in fully finishing the laundry room, so don't want to put the $ into a stud wall, and lose the precious inches.


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Old 01-21-2011, 10:45 AM   #2
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rigid insulation in basement

I'd be looking at extruded polystyrene - the blue stuff - that comes in 2'x8' sheets. Not the white stuff, that's not as efficient an insulator for the $$. Thickness will depend on what you fit in, but in Toronto, I'd be looking at 1.5" thick...those are about $18 each, I think. Look at gluing them to the walls with appropriate glue and tape the joints; look into doing the same for the space above your joists.

The codes say they should be covered with drywall, but what you do is of course your own responsibility.


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Old 01-22-2011, 12:36 AM   #3
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rigid insulation in basement

The foam board should be taped and sealed so no interior air can get to the concrete block to condense there, Fig. 17; http://www.rlmartin.com/buildingscie.../enclosure.htm
Laundry rooms are moisture producing rooms.

Don’t forget the rim joists, as CC said; http://www.rd.com/57548/article57548.html

I would be concerned leaving foam board exposed next to the washer/dryer, possible ignition sources. Especially a gas dryer, if so equipped. Check with your landlord on this and your Renter Insurance Policy, to be safe. Even if you used the blue foam below , covered with drywall and the upper wall covered with foil faced polyiso board (some B.D. let it be exposed, check with yours), fig. #12; http://www.buildingscience.com/docum...lation-systems

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Old 01-22-2011, 01:01 AM   #4
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rigid insulation in basement

You can buy foam that's recessed for furring strips. I'm putting in two layers of 2" foam, but the first 2" layer really made a difference.

If you get really ambitious and you want to put down tile in this rental, look into Wedi board to provide a thermal break.

Check out this video from Owens Corning:
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