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Old 12-23-2012, 07:02 PM   #16
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Floor over concrete


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Originally Posted by Bud Cline View Post
Tho that website sounds official...I'll bet for every guy you find recommending that method I can produce three professionals that would disagree vehemently.

Venting and air-flow accommodation is always necessary under the circumstances that guy has drummed up.

You have plenty of information for you to act-on...it's your decision. You seem to continue to want to justify your intent no matter what.
I've got no pre-conceived intent. I'm just looking for info so I can do it right. I've always had good luck getting useful advice from this forum in the past, and the best part is that I learn why things should be done in a particular way.

Maybe I'm being dense, but here's my confusion: In the case of a crawl space, you say that we need air flow and venting. But, as far as I can tell, products like dricore and platen don't require venting or airflow. So, it's bad to trap damp air in one case, but fine in the other? How does that make sense?

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Old 12-24-2012, 10:01 AM   #17
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Floor over concrete


Maybe I missed it but what kind of floor are you putting down you may not need a vapor barrier at all.
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Old 12-24-2012, 10:23 AM   #18
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This vapor barrier thing is being over thought as usual. How many millions of homes would you suppose have been successfully built slab on grade without any kind of vapor barrier and doing very well.

They have tile surfaces as well as wood, vinyl, bamboo, cork and plain stamped and polished concrete to name just a few and not one has ever wicked water up to the surface like a sponge as some would suggest.

If you ever see moisture on top of concrete within a building it's because of dew point temperature of the surface being reached resulting in condensation and not a sponge effect.
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Old 12-24-2012, 11:24 AM   #19
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This vapor barrier thing is being over thought as usual. How many millions of homes would you suppose have been successfully built slab on grade without any kind of vapor barrier and doing very well.

They have tile surfaces as well as wood, vinyl, bamboo, cork and plain stamped and polished concrete to name just a few and not one has ever wicked water up to the surface like a sponge as some would suggest.

If you ever see moisture on top of concrete within a building it's because of dew point temperature of the surface being reached resulting in condensation and not a sponge effect.
I'm sure that's all true. I've done lots of major home improvement projects over the last 4 years, and now whenever I walk around my neighborhood, I see all kinds of things that are seriously wrong. Those houses are still standing and inhabited.

Regardless, I like to do things the right way. And mold can be an issue here---we have a winter monsoon-like season where it rains more-or-less constantly for 4 months. That's why I want to be especially careful with this particular project.

I'm glad for all the responses, but I don't feel like I understand the situation well enough to act just yet.
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Old 12-26-2012, 01:36 PM   #20
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Just in case anybody is looking at this in the future, I think I finally get it. Here's a very good article (and not just because he makes fun of the loonies in California, where, unfortunately, I happen to live):

http://www.buildingscience.com/docum...ms?full_view=1

In particular, see Figure 3, since that pretty much says it all, at least wrt my particular application.

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