Exterior Closed Cell Spray Foam Insulation
Latest project includes 1" extruded tongue and groove foam boards (XPS) to the exterior of the sheathing. I've done this before. But I'm considering using 1" of ccspf instead.
The big plus is that it substitutes dozens of fiddly joints and fittings and seals for one or two days of exterior spraying. And it will be tight and secure. The big negative is cost--up to C$2.50 per sq. ft. plus the rental cost of an aerial work platform and more expensive brick ties that can accommodate up to 4" of vertical adjustment.
Anyone tried this method?
Comments (6)
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Comments (6)Yup That's Ohio for ya. 2 weeks ago it was subzero and today it was 60's. Go figure!!. We will be doing most of the work on the basement ourselves without a defined time-line. Some things we do plan on hiring out but for the most part are hoping to DIY. WE could probably do the XPS, particularly since we are not on a time line but have to consider the value of our time as well. My hubby travels for work a fair amount and that may prolong our installation period. We are going to call a few guys out for quotes and see what they come back with and try and do a direct cost comparison and see where we fall. We talked to a guy the other day that does the soy-based closed cell foam so I suppose we will start there. I am still confused as to whether or not to insulate the floor with XPS or put down a plastic layer product such as the DeltaFl I have heard about. My biggest concerns is to have a warm and comfortable floor. We will most likely use a combination of flooring materials including tile, engineered HW, and carpet. I have hear that a lot of people simply put down a thick pad with carpet and call it a day but I am not sure if that really is the way to go. Thanks so much for your information. I greatly appreciate it. Kristen...See MoreOpen or Closed Cell Foam Insulation?
Comments (1)See "Understanding Foundations" from Building Science Corp. "The most cost effective approach involves a combination of rigid insulation and a frame wall assembly .... The least risky interior insulation assemblies from an installation perspective and water sensitivity and drying perspective utilize spray foam--either closed cell or open cell." Either type allows drying to the basement. On my most recent project I used BASF closed cell insulation for the entire basement, rims, garage ceiling and other hard-to-reach areas. On others, I've used open cell insulation at the rim joists and XPS on the walls. I don't like open cell because it requires more to achieve the same R value. Also, when sprayed on cold walls, it shrinks noticeably and I've ended up trying to fill the gaps with hand held spray foam....See MoreWhat White paint 2 use on Yellow Closed Cell Foam Insulation in Garage
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Comments (43)Nothing about your home should keep you up at night. If concerns about using a particular construction material or method will do that, then don't use it. However, if we never applied any new materials, systems, and construction methods in residential construction, our homes would be no more comfortable and perform no better than homes built in the 1700's. We wouldn't have, for example, air conditioning, which makes living here in coastal Virginia much more pleasant in summer and which keeps certain contractors in the Houston area employed. The energy crisis in the 1970s gave rise to the use of house wraps and vapor barriers which caused plenty of unintended consequences. That doesn't make polyethylene or house wrap bad materials, it's simply that the building science wasn't established at the time. We continue to rely on the researchers to thoroughly test new ideas (and real world testing is better than computer simulations) to minimize, if not preclude, unintended consequences. When considering the use of the latest and greatest materials homeowners would be well advised to remember the old adage: The early bird gets the worm, but the second mouse gets the cheese!...See Moreworthy
4 years agolast modified: 4 years agoLooking at ccspf of R7.5, plus fg batts between the studs to meet Ontario Building Code (OBC) min. of at least R24.
Here's the architect's drawing for XPS on the exterior. (Instead of the polyethylene pillow on the rim joists, I will use ccspf. As well, if I use ccspf for the walls, the Blueskin can't be used as the heat of the spray destroys the adhesion, says the spray contractor.)
Ratio of exterior to interior insulation.I've built several homes in our Climate Zone 5 with 1" XPS on the exterior, unfaced fg batts on the interior. I lived in one for six years and kept up with that buyer for a few years. No visible problems.
Here's Dr. Joe: "I grew up with this wall in Ontario - 2x6 wall with R-5 foam sheathing (Photograph 2) coupled with unfaced fiberglass batt cavity insulation covered with an interior 6 mil poly air/vapor barrier (Photograph 3). This wall is currently being built all over Minnesota and Wisconsin. It is still being built in Ontario. And it works." *
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spray foam under the slab
I hadn't heard of that before the spf contractor made that point too. Thanks for the confirmation! I will decide when closer based on price.
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a liquid applied air barrier in lieu of the spray foam
As you say, no insulation value to that. What I typically see here on high-end infills is simply housewrap over sheathing.
relocating to a more southern climate
Actually, before the upper end housing market collapsed here, we were all set to move south--to New Hampshire. We're not fans of heat. Or alligators!
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4 years ago
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