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Old 01-08-2013, 06:56 AM   #16
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floor caved in...


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Originally Posted by thehvacguy View Post
How does moisture travel upwards from the ground where we need to put vapor barrier on the dirt???
Uh, it's called evaporation.

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Old 01-08-2013, 06:57 AM   #17
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floor caved in...


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How does moisture travel upwards from the ground where we need to put vapor barrier on the dirt???
Uh, it's called evaporation. Where I live, a crawl space vapor barrier is required by code.
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Old 01-08-2013, 09:39 AM   #18
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floor caved in...


It's required here to.
It's the main reason that floor failed.
Moisture cause fungus to form. Fugus eats the cellulos in the wood, onnce it's gone the wood falls apart.
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Old 01-08-2013, 09:53 AM   #19
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floor caved in...


Joe,

In reading this, I have a crawl space in a newer addition where there is no vapor barrier. Is this something that is just more or less placed down on the dirt? What would be the best way to ensure that no moisture gets through sides where the moisture barrier contacts the foundation?

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Tom
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Old 01-08-2013, 10:32 AM   #20
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floor caved in...


Depends on how bad it is under there. Some areas are just dryer then other's.
Lots of times the area was never back filled under the addition so it's now lower then the outside grade once it's been graded. No gutters, or no one took the time to seal the outside of the foundation before back filling.
It's suggested to run the plastic up the foundation, and use constrution adhesive to hold it up.
You can stake it down with 16" insulation hangers bent in half.
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Old 05-27-2013, 09:54 AM   #21
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floor caved in...


I did put a vapor barrier under my apartment when I went down there to fix my plumbing. In the last six months I been in Idaho I have seen a vapor barrier on every house that has a crawl space. In LA I been working for the past 7 years and been under thousands of houses and I never seen 1 vapor barrier in LA... Also the dirt on the side of my apartment is about 16" above the top of the footing. So we leveled it out and used the dirt elsewhere. This building was constructed in the 50's and from what I understand we are lucky there is a concrete footing let alone having the outside sealed... I'm gonna have to bust a Holmes on homes and dig around the building and seal it up. I just look at it as a good excuse to play with the mini ex

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