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Old 11-11-2007, 11:33 AM   #1
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Building into garage


I am building a great room/game room in my garage taking out the garage door and enclosing it with walls and windows and am wondering if I need to have any ventilation system under the flooring. I plan to attach vents to the existing heating system of the house; putting in I-joists with subflooring and hardwood on top of that. I have had some suggest that I need some kind of system in order to take care of humidity/condensation. Any ideas?
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Old 11-11-2007, 02:21 PM   #2
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Building into garage


a moisture test of the existing floor yet ?
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Old 11-12-2007, 03:13 PM   #3
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Building into garage


No actual test. It seems to stay pretty dry except for a little under the garage door (which will be replaced with a wall) when it rains and blows from that direction. Otherwise, it's dry.
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Old 11-12-2007, 03:25 PM   #4
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Building into garage


tape down a 2.0 x 2.0 piece of plastic w/duck tape for 24 hrs,,, see what, if any, moisture collects 'tween the plastic & the existing floor,,, apologies for the incomplete,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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Old 11-14-2007, 08:17 AM   #5
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Building into garage


OK, so I did the moisture test ... and it was completely dry. So do you think I need any kind of ventilation under the flooring??
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Old 11-14-2007, 12:27 PM   #6
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Building into garage


nope, i don't think you do, jim,,, still to be safe, i'd install p/t 2x4s on edge,,, then cover w/6mil plastic sheeting.


btw, is there a floor drain in the room ?
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Old 11-14-2007, 12:57 PM   #7
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Building into garage


Jim, where are you located?

I agree with the above poster, I would do the same, especially if you are going to go with a hardwood for the floors.
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Old 11-14-2007, 02:33 PM   #8
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Building into garage


Sounds like a good idea. Thanks. No floor drain.

I am putting in hardwood floors.

I live in central Iowa.
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