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post #1 of 20 (permalink) Old 11-04-2012, 12:38 PM Thread Starter
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Default Help. In A Quandry

My Honey-Do List today has an item I'm resisting on.

She wants me to measure all the vents under the house for covers. She thinks covering them will reduce the power bill this winter... We do have really good insulation in this house...

In the past, as a contractor, I had been hired to replace subfloors, floor joists and floors rotted out from dampness and inadequate venting. So with this past in-hand personal experience, I don't think this is a good idea. I've told her this, but she still has this in her head.

Anyone with any thoughts on this?

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post #2 of 20 (permalink) Old 11-04-2012, 12:47 PM
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Originally Posted by MAFoElffen View Post
My Honey-Do List today has an item I'm resisting on.

She wants me to measure all the vents under the house for covers. She thinks covering them will reduce the power bill this winter... We do have really good insulation in this house...

In the past, as a contractor, I had been hired to replace subfloors, floor joists and floors rotted out from dampness and inadequate venting. So with this past in-hand personal experience, I don't think this is a good idea. I've told her this, but she still has this in her head.

Anyone with any thoughts on this?
dont do it it is of the utmost importance that the sub space be well ventilated else you will end up with mildew problems and belive it you dont want that and furthermore it will increase your heating bill since the subfloor insulation will become damp and lose it,s insulating qualities i hope this answers your question good luck. regards jack
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post #3 of 20 (permalink) Old 11-04-2012, 05:15 PM
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Ditto to Jack's comments! Are you referring to a crawl space, Mike?
If anything you could increase the depth of insulation in the joist spaces; far more bang for your effort than closing off the ventilation...
Just show her the Building Code. That always (usually?) settles an argument
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post #4 of 20 (permalink) Old 11-04-2012, 08:05 PM
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In our climate we have to seal the crawl space for winter but I open it up again in the spring when it warms up. Even with the space sealed and my water lines wrapped with insulation I've still had my water freeze up.The best policy is to insulate the skirting and heat the space with some ventilation to move air around but that isn't always possible. If your floors are warm and your water never freezes up then you probably don't need to worry about it. There are other ways to save energy such as window insulating films and making sure the weatherstripping around doors and windows are in good shape. Good heavy curtains on windows helps too.

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post #5 of 20 (permalink) Old 11-04-2012, 08:11 PM Thread Starter
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Ditto to Jack's comments! Are you referring to a crawl space, Mike?
If anything you could increase the depth of insulation in the joist spaces; far more bang for your effort than closing off the ventilation...
Just show her the Building Code. That always (usually?) settles an argument
Dan-

Yes, referring to a crawl space. 12" thick of insulation already in the floor joists (bottom of subfloor to bottom of joists, 2 6" layers). 6" of insulation in the outside walls. 12" of insulation in the attic crawlspace (6" layer and 6" blown).

More insulation down under? Really? LOL. I would have to add a framework below the joists to suspend it from...

"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."

Last edited by MAFoElffen; 11-04-2012 at 08:15 PM.
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post #6 of 20 (permalink) Old 11-05-2012, 07:32 AM
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Mikey - Please inform Sharon that it is not a good idea. More than likely, your vents are an 8" tall x 16" length. Most can be closed from the outside. Your insulation needs to stay dry and closing it off solves [temporarily] one problem, but brings several new problems with it. I've seen under homes where this (vent closing) had been done and it starts a chain reaction of problems in most cases. Buy her some thicker socks or some bedroom slippers, and have a very nice day, week, winter!

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post #7 of 20 (permalink) Old 11-05-2012, 09:04 AM
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As you know closing up your vents is not such a good idea for the reasons given by other forum members. However none of them have mentioned the topic of Radon Gas. If you live in hilly rocky country Radon Gas is much more common that people think.

I would advise you to do a little internet search on Radon Gas Hazards and more importantly Radon Gas Home foundation ventilation recommendations. Share this information with your wife. This is not meant to alarm you or your lady. But closing vents is going in the wrong direction.

While I'm on my soap box about Radon, If you haven't already done so, get a Radon test kit. There inexpensive and a very wise precaution.

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post #8 of 20 (permalink) Old 11-05-2012, 09:17 AM
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I will 2nd Charles post, In Colorado it gets very cold in the winter time and it's good to seal up the crawl space and open it back up in the spring time...most of the homes in Colorado do not have insulation under the floors in the crawl space they do it that way to keep the pipes warm in the winter..

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Originally Posted by Cherryville Chuck View Post
In our climate we have to seal the crawl space for winter but I open it up again in the spring when it warms up. Even with the space sealed and my water lines wrapped with insulation I've still had my water freeze up.The best policy is to insulate the skirting and heat the space with some ventilation to move air around but that isn't always possible. If your floors are warm and your water never freezes up then you probably don't need to worry about it. There are other ways to save energy such as window insulating films and making sure the weatherstripping around doors and windows are in good shape. Good heavy curtains on windows helps too.



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post #9 of 20 (permalink) Old 11-05-2012, 09:40 AM
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My wife believes me when I tell her that something is not a good idea, and give her the reason(s) why. I'm confident your other half trusts you enough to understand that you have good reasons for why it is not a good idea.
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post #10 of 20 (permalink) Old 11-05-2012, 10:22 AM
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Geez, 12" ?! Mygawd, Otis is bang on, warmer socks and slippers. You could also explain (again?) how thermostats work...
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