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Old 12-09-2009, 01:50 AM   #1
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Closing Crawlspace Vents -- temporarily


my house in Northern California was finished in ~1999 and has a perimeter foundation. The crawlspace is clean and is roughly 3' from the bottom of joists. With the very cold nights recently, i am wondering if i can close the crawlspace vents (~3.5" X 13") with rigid insulation for a month or so. what do you think? This should keep my house a bit warmer.

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Old 12-09-2009, 01:56 AM   #2
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Closing Crawlspace Vents -- temporarily


I don't see why not. Just use cardboard cut to fit. Is there any moisture or mold.

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Old 12-09-2009, 07:28 AM   #3
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Closing Crawlspace Vents -- temporarily


Mine have shutters that slide closed for winter. Just remember to reopen them in warmer weather.
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Old 12-09-2009, 07:31 AM   #4
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Closing Crawlspace Vents -- temporarily


I would not use cardboard - if moist mold will grow
Rigid will work
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Old 12-09-2009, 07:41 AM   #5
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Closing Crawlspace Vents -- temporarily


As a former Northern California dweller I know the feeling but the vents are there for an important reason and I would not close them off.
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Old 12-09-2009, 08:01 AM   #6
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Closing Crawlspace Vents -- temporarily


Quote:
Originally Posted by sdsester
vents are there for an important reason and I would not close them off.
if i got it right, the vents are there to prevent mold. the crawlspace is dry and not moist, particularly in the winter. so i am inclined to put rigid insulation "stoppers" on the vents from late Nov thru Feb.
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Old 12-09-2009, 08:03 AM   #7
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Closing Crawlspace Vents -- temporarily


If your climate is damp like ours, the vents are really important to keep the M/C of the timber below 20%, when dry rot will attack the flooring.
Most of the floors I have seen over the years where the vents have become blocked have had rotten floors.
However it might be OK for a month or two, but I wouldn't like to say for sure.
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Old 12-09-2009, 08:03 AM   #8
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Closing Crawlspace Vents -- temporarily


Many vents sold & installed are auto-closing in colder Temps
Its done all the time

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