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Old 10-18-2013, 08:34 AM
 
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Some information on the subject from Building Science, Advanced Energy, Green Building Advisor:
BSI-009: New Light In Crawlspaces — Building Science Information
Building an Unvented Crawl Space | GreenBuildingAdvisor.com
http://goo.gl/WGhf77

"I've never understood the desire to build a crawl space.
If you don't like a slab, and you're not willing to dig a basement, it's better to put the house on piers and let the wind blow clear under the house. At least that way you're not devising a mold factory." - Martin Holladay, GBA Advisor
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Old 10-18-2013, 10:09 AM
 
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This is mine after lining w/ the 6 mil nylon reinforced plastic. Did it for under $250. It took a few weekends to complete. Pretty much anyone can do it as long as you don't mind getting dirty.





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Old 10-18-2013, 10:26 AM
 
Location: Cary
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Definitely looks different than the builder grade stuff I originally had. It must have been 2mil material. What did you use to adhere the plastic to the cinder block?
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Old 10-18-2013, 10:50 AM
 
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C_Lan, this is nylon reinforced and feels far more durable than the type you might find at home improvements stores. It's designed for crawl spaces.

I attached it to the block with two sided butyl tape and the christmas tree pins that sacredgrooves referred to. Areas like the piers and corners also received polyurethane sealant to guarantee a seal.

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Old 10-18-2013, 11:13 AM
 
Location: Cary
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Ah, OK...thanks. Didn't see the pins and thought it was just taped in place. I ended up shooting nails through pressure treated wood strips to help hold mine in place.
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Old 10-18-2013, 03:56 PM
 
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Theklunk, thank you for sharing your experience.

Where do you get butyl tape and Christmas tree pins in town?

Also, in your picture, does the vapor barrier line the floor and continue up the walls or are they two separate pieces?

Thanks!
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Old 10-18-2013, 04:36 PM
 
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The wall pieces are separate from the floor pieces. Overlap 12" at the bottom. Wall pieces go on first.
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