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Old 01-20-2012, 05:46 PM   #1
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another crawspace question


Hello and thank you in advance...I Live on the coastal side of virginia..humid summers ice cold winters, not alot of snow, my crawlspace does have the plastic barrier over dirt, no moisture problems and drainage is good, my insulation looks ok, couple of places needs to be replaced, rim joists and banding all the way around the perimeter i can see are not air sealed or insulated no more than the insulation in each joist bay. I plan to add to or add insulation in a month or two when some money free;s up. My problem is really cold tile floor through out the house. And was wondering would closing my vents in crawspace and airsealing the permiter banding help by not allowing that cold air blow in like a breeze. If not what are ya'll suggestions?Any idea's or feedback are appreciatiated

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Old 01-20-2012, 09:05 PM   #2
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another crawspace question


This seems to be the hot topic.

I'm in NC and have my crawlspace vents closed and sealed. I do have poly on the ground. Rim joist is sealed with some insulation.

Right now the air temp in the crawlspace is 60 degrees and rh 55%. It's 42 degrees outside.

I have no insulation on the crawlspace walls but plan to add some. There is fiberglass batt insulation in the floor joist bays. Tile floor in the down bath is still cold but wood floor does not feel cold.

As is always recommended, check with your local building code office for specific requirements.

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Old 01-20-2012, 10:28 PM   #3
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another crawspace question


Air seal the bands, vents and penetrations.

Move the insulation layer to the stem wall of the crawl and make sure the poly vapor barrier is tight and well sealed to the wall.
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Old 01-21-2012, 10:41 AM   #4
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another crawspace question


thank you both, Hey Windows on Was what do you mean by stem wall?And whats recommended to use for sealing the poly barrier to the walls? thanks again ya'll
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Old 01-21-2012, 01:26 PM   #5
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another crawspace question


Stem wall = crawl space wall.

Any good sealant that is compatible with plastic will work for the seams and joints at the walls/pillars.
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Old 01-21-2012, 03:32 PM   #6
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another crawspace question


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Originally Posted by Windows on Wash View Post
Move the insulation layer to the stem wall of the crawl and make sure the poly vapor barrier is tight and well sealed to the wall.
That statement has me confused. Are you stating that the poly vapor barrier is an insulator for a crawlspace wall? Or are you referring to two separate materials?
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Old 01-21-2012, 04:21 PM   #7
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another crawspace question


Two separate materials.

Run the poly up the wall and seal it to the wall.

Apply the insulation to that wall.

Check code for insulation requirements (i.e. ignition barrier requirements).

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