"1. If it is wet enough that CC will not allow it to dry and OC soaks it up like a sponge, then the Crawl needs to be stripped back to dirt and the stem walls to concrete and a proper drainage system put in, the Class 1 Vapor Retarder replaced…"
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Jennifer Rupnow
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John Nicholas replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)
Sean Lintow Sr replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"So following with that logic, your basement walls should also be OC? Sorry but you still have numerous ways for said area to dry out without soakiing everything else & it isn't going to rot just because it is "wet"
Jorry, you…"
Armando Cobo replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"John, Drying is the whole idea... with a closed cell it'll never get a chance to dry out and it'll rot; or maybe we need to agree to disagree on the building science of it."
John Nicholas replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"No! Open cell on a wet surface will act like a sponge and the moisture will stay in contact with the wood."
tedkidd replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"I'm not a believer in vented crawl spaces but maybe in some climates there are reasons for them. I'm also not a fan of counting on natural (rather than mechanical) ventilation for accomplishing any goal you hope…"
Armando Cobo replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"On the contrary, if there is any wicking through the concrete or any moisture leaks on the rim joist, the open cell will allow any wood and the wall assembly to dry."
Ken Girdley replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Hi Jennifer,
Glad to hear that you are friends with the contractor and just trying to gain information. His installation is not "best practice" but it is an accepted installation method. As I mentioned in a previous post, best…"
Debra Monte replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Jennifer, here is a good article and there are others at this site:
http://www.greenbuildingadvisor.com/blogs/dept/musings/building-unvented-crawl-space"
Ken Girdley replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Debra, being a BPI certfied contractor, I agree but Jennifer didn't provide enough information for us to accurately assess the conditions so I stand by my 90% statement. By the way, code is for new construction. This is an…"
Ken Girdley replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"This is an unconditioned, vented crawl space."
Debra Monte replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Code is minimum and it appears that the vapor barrier didn't even reach the walls in areas as per the photos. 90% humidity is not going to really resolve all the issues for the homeowner who is having respiratory issues. While I…"
Jennifer Rupnow replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Hey Ken,
This contractor is a close friend of mine who I have referred a lot of work to & have provided resources for continuing education in home performance. There is no intention to "nail" anyone, but would like to work with…"
Sean Lintow Sr replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"I am not sure what the codes say in Cali but (unless I am overlooking it) there is no requirement in the 2009 IRC or IECC for "vented" crawls
For sealed crawls it is;
R408.3.1 Exposed earth is covered with a continuous Class I vapor…"
Ken Girdley replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"Yes, the purpose of the barrier is to trap the moisture to keep it from getting into the conditioned space. That is why best practice tells us that we run the membrane up the foundation wall, terminate it approximately 6 inches below the mud…"
Debra Monte replied to Jennifer Rupnow's discussion Crawlspaces & Barriers: Installation Standards / Best Practices for BPI Professionals & Contractors ? in the group Building Performance Institute (BPI)"You are certainly correct.
Keep in mind that the Contractor is probably trying to work within the codes for his particular area. The ICC and energy codes are being updated.
If you are going to keep a crawl space unconditoned and ventilated,…"
Sean Lintow Sr replied to Jennifer Rupnow's discussion Crawlspace Vapor Barrier: Install Correction and Future Guidance in the group Best Practices (Residential)"Actually if there is any chance of water impacting it, it should be closed cell"
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Comment Wall (4 comments)
- At 3:25pm on December 1, 2011,
Graham Ralfe said… I would like to have seen more Real tors and Loan Officers in this last seminar. Better luck this next time.
John Shipley did an EEM webinar for C.A.R. yesterday morning. John was instructor for my CalCERTS EEM certification class in Tulare at the Edison Education Center. He knows his stuff.
I will look forward to your post.
- At 3:05pm on December 1, 2011, Graham Ralfe said…
Hi Jennifer,
I enjoyed the workshop and look forward to Kevin Nunn's next seminar here in the Fresno area. Do you know when and where yet? Gordon was saying perhaps this month.
- At 1:07pm on August 19, 2011, Graham Ralfe said…
Hi Jennifer, waiting for Energy Upgrade to make it in the Central Valley. Gordon Smith and Frank Henry are getting the word out. The CBPCA and CONSOL BPI classes are starting to fill up fast.
Graham
- At 7:49pm on April 14, 2011,
Diane Chojnowski said… Hi Jennifer,
Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!
Don't forget to upload your profile photo. And add your location on our Member Map!
Thanks!
Diane, HEP Moderator
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