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  • The Best Way to Insulate a Rim Joist - Green Building Advisor
    Spray-foam kits (about $360 for a 200-bd -ft kit) are available in either open- or closed-cell foam Open-cell foam is R-4 per inch and allows vapor to pass through it, which lets the building dry to the inside
  • Flash-and-Batt Insulation Method - GreenBuildingAdvisor
    Flash and batt is a hybrid insulation approach combining fiberglass insulation and closed-cell spray foam Fiberglass devoured the insulation industry in the 1970s, for obvious reasons
  • Are there any green, non-VOC spray foams? - GreenBuildingAdvisor
    I'm looking into doing closed cell spray foam for my floor, but the hazards really concern me I would like my insulation to be green as possible, without sacrificing quality I have read that even soy based (or alternative spray foams) are still quite harmful to breath Is this true or are there any options that have been proven as a green alternative?
  • Open- vs. Closed-Cell Spray Foam - GreenBuildingAdvisor
    Everyone agrees that spray polyurethane foam does a great job at reducing air leakage But which type of insulation makes the most sense: open-cell foam or closed-cell foam? GBA presents two spray-foam experts — Jim Coler, the owner of Coler Natural Insulation in Ionia, New York, and Neal Ganser, a spray-foam consultant from Bozeman, Montana — who explain the advantages of the two main
  • Spray foam against underside of roof deck? Or install vent baffles?
    The amount of closed cell spray foam or rigid insulation is somewhere between 20% to 50% of the R value of the overall cavity insulation depending on your climate zone
  • What type of insulation should I install under the floors of pier . . .
    The easiest solution -- but not the cheapest -- is closed-cell spray polyurethane foam Another option is rigid foam (EPS, XPS, or polyiso) You can cut and fit the foam between the joists -- a laborious process -- or, better yet, extend it across the bottom of the joists
  • Closed spray foam insulation in attic - GreenBuildingAdvisor
    Closed cell spray foam is not normally trimmed flush with the rafter edges, it's usually underfilled a bit That would leave you with an air space between the spray foam's inner facing surface and the back of the polyiso panels
  • Repairing Damaged Spray Foam - GreenBuildingAdvisor
    Will the closed cell foam surrounding the pipe need to removed so the new spray foam adheres? And approximately how much? I have the same problem of the closed cell foam separated from joists in many areas of my attic
  • More spray foam: maximum rafter cavity fill vs underfill and covering . . .
    If you completely fill the assembly, and assume R6 inch for closed cell and R4 inch for open cell, you have about 9 25" worth of foam sandwich in between the 2x10 rafters I'll assume R1 inch for the rafters If you have rafters 24" on center, a simple average gives a whole assembly R value of about R39
  • To Vent a Spray Foamed Roof Deck, or Not? - GreenBuildingAdvisor
    With 6" of closed-cell spray foam (CCSPF), you don't really need venting, as the spray foam is considered a vapor barrier However, the venting won't hurt anything other than taking up space in your rafters that could be used for more insulation Venting will have little or no value in the skylight bays, as they are not continuous from eave to





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