Best Practices for Installing a Crawl Space Vapor Barrier

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christinescoms

Member
Hello everyone,

I’m in the process of installing a vapor barrier in my crawl space and have a few questions. Should I opt for a thicker barrier or is a thinner one sufficient?

I’m also wondering if I need to seal the seams with tape or adhesive, and whether I should cover the entire ground area or just specific sections.

Additionally, is it necessary to extend the barrier up the walls, and if so, by how much?

Any tips on installation to ensure effectiveness would be greatly appreciated.
 
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christinescoms said:
I’m in the process of installing a vapor barrier in my crawl space and have a few questions. Should I opt for a thicker barrier or is a thinner one sufficient?
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That's down to your local building regulations / codes. Also check if you need gastight or semipermeable.

Please respond to your existing questions rather than leaving people without a response.
(And stop duplicating question before anyone has even had chance to read them!)
 
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Thinner barriers (6 to 10 mils) can be used but are more prone to damage. A thicker barrier, such as 12 to 20 mils, is more durable and resistant to tears and punctures.
 
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I have plastic stapled to the bottom of the floor joists to keep the insulation dry. There is nothing on the ground.
In another house the plastic is on the ground and not on the house. The ground under the plastic is mud.
I do not know what is code. I cousin did both.
 
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I would focus on local building codes because temperature range, humidity and construction norms (materials, rat walls, and drainage ) all affect condensation in the interior and wall-side of the vapor barrier. The condensation can lead to mold and mold spores as well as rot to any adjacent lumber. Talk to your local building department.
 
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