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Old 01-17-2010, 10:08 PM   #1
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Closed crawl space under house


I want to close in a 3-4 feet high crawl space under my house. I have brick piers so I figure I will put 2 x 4 frame between the piers. Upstate NY rustic cabin so I think I will use local lumber board and baton on the exterior and then insulating blanket on the inside. What think?

My question is how to take close down to the dirt level? I will keep the 2 x 4 several inches off the dirt and have the board and baton go down a couple of inches off the ground but how can I close off to the ground? Flashing to cover the last couple of inches?

Any ideas?

Or any better ways of doing the whole job appreciated.

Thanks,

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Old 01-17-2010, 11:16 PM   #2
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Closed crawl space under house


Hello.

Are you trying to completely seal off for vapor and heating reasons or completely off to everything and everyone ever again or some sort of storage space???

In the book Foundations and Concrete Work by the Taunton Press there was a chapter about sealing crawl spaces and how they used a heavy plastic screwed to the sill walls and tapped it all together with duct tape.

It was a little more complicated then this but maybe you want to buy it can find the article on line or at the local library???

Hope this help.s

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Old 01-18-2010, 07:51 AM   #3
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Closed crawl space under house


So it's currently open between the piers?

You could lay a ground-contact rated PT 6x6 between each pier and frame down to it.
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Old 01-18-2010, 07:54 AM   #4
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Closed crawl space under house


untreated wood 8" min to ground
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Old 01-18-2010, 08:31 AM   #5
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Closed crawl space under house


Currently it is not sealed at all. Open between the piers. I am on a hill side and the wind blows right under the house. I won't be able to completely seal off the crawl space air tight and I do need access to it. I don't think I will be laying down a PVC barrier on the ground. I just want to make an inmprovement. Stop the wind, stop as much air movement as possible, and raise the temperature in the crawl space a few degrees.

What is a ground-contact rated PT 6x6? Meaning treated lumber on the dirt level?

The project is about insulating the floor of the house by sealing off the crawl space the best I can.

I might also insulate the inside walls that I build between the piers. But I don't want to use fiberglass bats. I want to use some stiff board insulation that is not too expensive. Any suggestions?

Thanks for the help.

Last edited by DeanPk; 01-18-2010 at 08:35 AM.
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Old 01-18-2010, 08:34 AM   #6
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Closed crawl space under house


marine/ press treated ply nailed to frame then side
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Old 01-18-2010, 08:41 AM   #7
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Closed crawl space under house


Ok.

So I frame with 2 x 4 between my piers.
I use a treated 6 x 6 bottom plate right on the dirt and frame down to it.

I want board and baton on the outside mostly for the looks.
Then I use marine ply on the inside as insulation.

Does that seem reasonable?
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Old 01-18-2010, 08:44 AM   #8
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Closed crawl space under house


I would build frame, press treated, test fit, apply ply install with tapcon side over ply
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Old 01-18-2010, 02:06 PM   #9
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Closed crawl space under house


If you seal off the sides between the piers, even if not completely tight, you should lay down a fairly heavy plastic poly on the ground and it will really help to keep the moisture down under there.
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Old 01-20-2010, 11:43 AM   #10
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Closed crawl space under house


Quote:
Originally Posted by DeanPk View Post
Ok.

So I frame with 2 x 4 between my piers.
I use a treated 6 x 6 bottom plate right on the dirt and frame down to it.
If you lay pressure treated (PT) wood on the ground, make sure it is rated for "ground contact." Some PT wood is only treated lightly, for exposure to the elements, but not for touching the ground. There's a little tag on the end that tells you.

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