"Any bets on how long it will take this company to land in court?
A local energy efficiency group in…"
Sealing crawlspaces and insulating them with polyurethane foam
Joe Lstburek and John Tooley are both sold on sealing crawlspaces. I saw a short bit of "Holmes Inspections" on HGTV where they sprayed 2 lb polyurethane foam directly onto the dirt floor underneath a raised kitchen addition and sealed the crawlspace essentially turning it into (semi?) conditioned space. I think they sprayed it onto the dirt, I could be mistaken.
My question is: Does it make sense to spray the foam onto the dirt so as to avoid having to install a moisture/vapor barrier, seal it with tape and them add foam on top of that and seal it with tape.
Does anyone have a good supplier of the thick white material that the East Coast companies use on their sealed crawlspaces?
Can anyone direct me to the best practices for such a project? I'm also wondering if someone has a detail for sealing and waterproofing the 12x4 vents in the stucco.
Mr. Tooley stated that sealing/insulating a crawlspace can yield a 15% energy savings. Does anyone have experience with energy savings percentages in California's Central Valley?
It seems that sealing under houses has many benefits but where are the great examples of it done right?
Thanks,
George Matthews
Views: 2198
Replies to This Discussion
-
Permalink Reply by David Meiland on -
Ground cover in the crawl space with have NO effect on foundation movement caused by soil MC. That is an exterior drainage issue.
-
Permalink Reply by Scott on -
George,
The sealed crawlspace concept is very popular here in North carolina and surrounding states. The best place to go for answers to your questions is advancedenergy.org and look up in their foundation sealing section. Some thoughts regarding your questions:
- It does not make sense to spray foam onto the dirt. The ground is a surprisingly good insulator. You want to insulate the peripheral walls of the crawlspace using a code-compliant R-value foam that is approved for exposed use under the Foam Plastics section of the Califormia Residential Code. In North Carolina, Dow Thermax Sheathing rigid insulation is by far the most popular option and was the one used by Advanced Energy when they built test residences to gauge the effectiveness of sealed crawlspaces.
- Raven Industries is the most popular manufacturer of poly to cover the ground and flash to the piers and wall insulation.
- Advanced Energy constructed twelve test houses and determined that a home with a sealed crawlspace should produce about 18% energy savings over a home with conventional foundation vents. Of course, that data was generated in Eastern North Carolina and results will probably differ in the Sacramento Valley. The good news for you is that the Advanced Energy Data suggested the bulk of the energy efficiency improvement came during the warm months so some reasonable level of savings should be expected in California. Humidity levels may impact the amount of that savings.
If you have any questions, please feel free to contact medirectly to discuss further
Scott Cummings
Sr. Technical Service Engineer
Dow Building Solutions
Charlotte, NC
-
Permalink Reply by George M. Matthews on -
I have a question about how to create a termite viewing area in a PU spray foamed foundation wall.
In crawlspace encapsulation one wants to bring the thick white plastic sheet up the foundation wall and make a nice connection with the foam (my insulation contractor does anyway). In doing that how would one create an area of 4" open clear concrete to look out for termite tunnels? Has any solved this problem?
My client who is teetering on the fence about encapsulating his unpleasant smelling crawlspace is thinking of just getting terminix out to inject termite poison into the ground around the perimeter before the project.
Anybody have a great detail for both energy efficiency and termite protection/observation? Thanks!
-
Permalink Reply by David Meiland on
-
There's a good piece on encapsulated crawl spaces here, and it almost-but-not-quite answers your question.
http://www.greenbuildingadvisor.com/blogs/dept/musings/building-unv...
- ‹ Previous
- 1
- 2
- Next ›
Home Energy Pros
Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.
Latest Activity
Nick Helmholdt replied to Joshua Knittel's discussion Google Thermal View? in the group INFRARED THERMOGRAPHY USERS
Matthew Redmond posted a status"Full house for NYSWDA's ASHRAE 62.2 course today. A lot of discussion on implementing this standard on NY State's diverse housing stock."
Paul Scheckel posted a blog postLess oil, more courage: Energy and Art
Hard to admit, but I'm not all fun-facts all the time. Sometimes I even pay attention to things…See More
Tom Delconte posted a blog postThe Surroundings Are Comprised of (fill in the blank) !
In Building Science…See More
tedkidd replied to Jose Macho's discussion Why Are Energy-Saving Home Inprovements Down??"Pat, I think you and I agree on a LOT of things.
One thing I don't want to see is more…"
tedkidd commented on Tom Delconte's blog post Robert Shiller Says Retrofits Are Never Worth It!"Bob B.
Buying a home is a good investment because it is forced savings more than a good…"
Joe Huang posted a discussionWhite Box Technologies launches Web-based weather data for building energy simulations
White Box Technologies is pleased to announce under agreement with ASHRAE the launch of WBT Weather…See More
Joseph Lamy commented on Jim Gunshinan's blog post The Universe Is Made of Stories"My life changed when I got 'ductalatored' - became familiar with proper sizing guides for…"
Judi Lyall joined allen p tanner's group
Energy Auditing Equipment for Sale, Trade or to Purchase
Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
© 2013 Created by Lawrence Berkeley National Laboratory.
