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  • Unvented Attic roof assembly - GreenBuildingAdvisor
    "Unvented assembly with continuous rigid foam above the roof sheathing and fiberglass batts, mineral wool batts, or cellulose under the roof sheathing " PatSauce | Jun 03, 2025 06:46pm | #6 As mentioned in the original post I am trying to avoid this due to a more complex and costly assembly
  • Vented vs. Unvented Attic - GreenBuildingAdvisor
    Using the word "unvented" does not preclude conditioning the space In fact I guess I unconsciously assumed that the people responding to my question would assume that that an unvented attic I was referring to would not only be properly constructed but also conditioned, as it should be I'm not looking for a "free lunch"
  • Unvented Attic with Trusses (New Build) - GreenBuildingAdvisor
    I want an unvented attic because my HVAC air handler and ducting will be in that space So my roof top to bottom will be: shingles, underlayment, 7 16” decking, 1” furring, 3” polyiso rigid foam, 5 8” zip sheathing, and an unknown interior insulation against the underside of the decking
  • Should I vent my unvented garage attic? - GreenBuildingAdvisor
    B) Unvented Insulated Attic – Treat garage attic same as house attic by installing open cell spray foam on roof deck and gable end Storage space in attic triggers need to drywall attic storage walls and ceiling to protect spray foam from fire danger C) Unvented Uninsulated Attic – Leave as is Monitor and implement option A or B down road
  • PODCAST: How to Insulate an Unvented Roof - GreenBuildingAdvisor
    Dana Dorsett | Nov 15, 2011 05:09pm | #3 In Louisiana unvented is THE way to go! Vented attics don't cool roofs (much), but in cool cold climates they purge the attic and roof deck of moisture coming from within conditioned space, sparing it from accumulating humidity all winter and rotting
  • Building an Unvented Crawlspace - GreenBuildingAdvisor
    Unvented crawl space in NJ Hi Martin Fantastic article I live in central NJ and have a vented crawl space connected to an unconditioned, unfinished basement and am considering sealing the 2 vents to create an unvented crawl space The crawl space is not sealed from the basement, air can flow between the two areas via the rafters
  • vented and unvented soffit – where when are each used?
    There are four locations situations that I am hoping for direction House eave (I believe this is where vented would be used in combination with a ridge vent), House Rake (unvented?) Unheated garage connected by a covered walkway to the house – eave (vented or unvented?) rake (vented or unvented) Location – Ontario Canada
  • Vented vs. Unvented Crawlspace - GreenBuildingAdvisor
    Vented vs Unvented Crawlspace mark_gil | Posted in Green Building Techniques on September 24, 2022 01:18am We’re undertaking a full renovation of a c 1920 house in the SF Bay Area
  • Is an Unvented Conditioned Attic a Good Way to Save Energy?
    Ted Storm is in the midst of a construction project and at a point where he needs to make a decision about attic insulation The unvented roof consists of standing-seam metal over synthetic felt and oriented strand board (OSB) sheathing Both HVAC equipment and air ducts will be located in the attic of this house in Climate Zone 4 Three insulation contractors are unanimous in their
  • High Humidity in Unvented Conditioned Attics
    Thanks for sharing the language of your proposed code change proposal concerning unvented attics insulated with open-cell spray foam The proposal you shared doesn't address the fire safety concerns that have been raised relating to the installation of forced-air registers or return-air grilles in attics with spray foam that lacks a layer of 1





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