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Old 01-12-2010, 08:52 PM   #1
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Sealing house vent?


My brick home was built in 1956 and has a 4 inch house vent that leads into the crawlspace. My furnace has its own direct outside air supply. My house has just been tested for its tightness. It is 54 on a scale of 1-100. With suggested renos I can only get it to 58. So the house is inherently leaky. Therefore I am wondering if I must just as well seal the house vent. Any comments?

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Old 01-13-2010, 05:53 AM   #2
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Sealing house vent?


They make thermostatically controlled(mechanical) crawl space vents that help. They open at 70 deg and close at 40 deg, or in that range.

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Old 01-13-2010, 06:33 AM   #3
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Sealing house vent?


Does the vent go from outside to crawlspace, or inside to crawlspace.

Normally you have a number of vents outside to the crawlspace, but you don't want any from the inside.
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Old 01-13-2010, 07:35 AM   #4
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Sealing house vent?


Pyper,

The vent is in the crawlspace wall and vents to the outdoors. The crawl space is dry with a concrete floor and there has never been any hint what-so-ever of moisture or mold.

I get the impression it should be sealed in the cooler weather and open in the warmer weather.
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Old 01-13-2010, 11:11 AM   #5
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Sealing house vent?


If you only have a single vent, it's probably not doing anything from a moisture standpoint anyway. If it was my house I'd close it off and monitor things -- closely for a year and sporadically after.
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