# Unvented, Conditioned Crawlspaces...

**URL:** <https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219>\
**Category:** Structural Inspections\
**Created:** [October 28, 2015, 5:37pm UTC](https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219 "2015-10-28T17:37:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ederousse](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/ederousse/32/210388_2.png) [@ederousse](https://forum.nachi.org/u/ederousse)\
**Post date:** [October 28, 2015, 5:37pm UTC](https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219/1 "2015-10-28T17:37:58Z")

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What do you guys know about “Unvented, Conditioned Crawlspaces?” I ran into my first one the other day, and although I didn’t see anything that out of the ordinary, that is for the exception of insulated foundation walls instead of the the flooring, and no ventilation, I didn’t see anything else that alarming. But I figure I better learn more about them now. Anyone got any experience with them?

Thanks ahead of time for any input,  
Ed

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**Author:** ![rcooke](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rcooke/32/57038_2.png) [@rcooke](https://forum.nachi.org/u/rcooke)\
**Post date:** [October 28, 2015, 5:56pm UTC](https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219/2 "2015-10-28T17:56:11Z")

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[http://www.bestofbuildingscience.com/pdf/Closed%20crawlspaces%20do%20double%20duty%20HEM\_SP05\_p32-36.pdf](http://www.bestofbuildingscience.com/pdf/Closed%20crawlspaces%20do%20double%20duty%20HEM_SP05_p32-36.pdf)

[http://www.justcalllarry.com/pdf/HomeEnergyDryingoutacrawlpace.pdf](http://www.justcalllarry.com/pdf/HomeEnergyDryingoutacrawlpace.pdf)

[http://www.advancedenergy.org/portal/crawl\_spaces/pdfs/Double%20Duty.pdf](http://www.advancedenergy.org/portal/crawl_spaces/pdfs/Double%20Duty.pdf)

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**Author:** ![ederousse](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/ederousse/32/210388_2.png) [@ederousse](https://forum.nachi.org/u/ederousse)\
**Post date:** [October 28, 2015, 8:42pm UTC](https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219/3 "2015-10-28T20:42:06Z")

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Thanks Roy!

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**Author:** ![eschmidt](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/eschmidt/32/89375_2.png) [@eschmidt](https://forum.nachi.org/u/eschmidt)\
**Post date:** [November 3, 2015, 5:47pm UTC](https://forum.nachi.org/t/unvented-conditioned-crawlspaces/101219/4 "2015-11-03T17:47:00Z")

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> [@ederousse](#):
>
> What do you guys know about “Unvented, Conditioned Crawlspaces?” I ran into my first one the other day, and although I didn’t see anything that out of the ordinary, that is for the exception of insulated foundation walls instead of the the flooring, and no ventilation, I didn’t see anything else that alarming. But I figure I better learn more about them now. Anyone got any experience with them?
> 
> Thanks ahead of time for any input,  
> Ed

Check to make sure that is conditioned, served by HVAC for the house, such as one or more supply ducts and a return air or opening to the rest of the house that allows the air in the crawlspace to be exchanged and conditioned. Crawlspace temperatures should be within a few degrees of the house. Cold spots are where condensation will occur. Bare dirt should be covered, a concrete slab is preferred, but heavy plastic is probably OK if it is sealed with tape or glue. There should not be any standing water.