Why You Should Close Your Foundation Vents

By
Home Inspector with Allen's Pest Inspections
http://actvra.in/48Zg
Putting foundation vents on our homes is an old fashioned idea. We spend lots of money each month heating & cooling our homes & by having a vented dirt crawl space it raises your monthly electric bill 15% (to 25%) every month, and will lead to a bigger expense with mold removal & rotted wood replacement. It's not the standing water that causes the problem in the crawl space it's the water vapor, also called Relative Humidity, that destoryes the home. Understanding relative humidity & where it comes from and how to control it is what everyone needs to no about. Air is a very efficient way to move water. Air, including humid air, moves easily in and out of spaces. Air brings its moisture content with it wherever it goes. When air is heated or cooled, it's relative humidity changes. Crawl spaces are cool, because the earth is around 55 degress year round. So when we bring in warm humid air into the crawl the air is cooled, and the humidity goes up. Having higher relative humidity causes condesation which causes mold, wood rot, lost energy & brings more pest problems to your home. Please learn as much as you can about your home & how to protect it & your family from mold, wood rot & overall health concerns related to wet moldy crawl spaces.  
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Anonymous #61
Anonymous
Torrey Jensen

    Im not getting any answers, just a bunch of arguing...  I live in western Washington, close to Seattle, and would like to know....  To close, or not to close, that is the question???????????????

February 04, 2012 09:04 PM
Anonymous #62
Anonymous
Allen

What if I say both? Opened and closed. I was reading my home repair guide and it says to close all except just the two on the right  in the front, and then just the two on the right in the back. So there would be an invisible diagonal line connecting the 4 open vents so the air comes in one way and out the other; due to pressure. Kind of like when you have one door open at one end of the house and another door opened at the other end creating a "wind tunnel". I am not saying I'm right; just looking to see if I'm wrong. I know all houses are shaped different and the diagram in the book shows it like a box with arrows (air) going through one side and out the other. I not throwing my two cents in and making a point- just because its in a book, I dont really know. Its just a thought and I would appreciate any input on this. Many thanks!

March 31, 2012 12:43 AM
Anonymous #63
Anonymous
Charlie

I live in Georgia and forgot to close my vents after winter. It is so much cooler I decided to just leave them open. I also noticed last summer it was a lot cooler before I closed the vents. About ten degrees. My electric bill dropped about $20.00. The floor is so cold I cannot go without socks or slippers. I'm loving it but after reading everyones opinion on this site, I'm really confused!! I'm going to go under the house and look for what?

May 27, 2012 02:58 PM
Anonymous #64
Anonymous
Donna Jacobs

I have a house that was built in the 40's.  The foundation has concrete block with the holds every several feet.  I do not know why or what to do with them.  Can I block them perminately?  There is plastic down on the ground under my house.  In 2011 I had renters in my house and after a devistateing tornado that distroyed many building within block of this house, the renteres had a terrible rodent problem.  It is cleared up now but I fell that the open blocks incouraged the problem.  Any ideas?

August 04, 2012 06:32 PM
Anonymous #65
Anonymous
Donna Jacobs

I should add that my house is in Alabama.

August 04, 2012 06:51 PM
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