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  • Adhesive and Sealant for Problem Screws on Metal Roof
    I've been having problems with the screws backing out on my metal roof Unfortunately, the sheathing used was 1 2" OSB I'm sure that was most of the problem Two years ago the contractor who installed the roof came out and tightened the screws A few screws were replaced with over-sized screws (5 16" hex head) To date none of those screws
  • Strapping necessary under metal roof? - GreenBuildingAdvisor
    Sheathed, vapor barrier, then rigid foam, then strapped The first house I built 40 years ago I constructed the same way except I used fiberglass batts, a cathedral ceiling, rafters exposed, sheathed with ship lap, then duplicated the rafters on top of that 2x10's laid a vapor barrier over it filled it with fiberglass batts strapped it, hung metal 40 years later my son bought the house and
  • Utilize an air gap under a metal roof above a conditioned attic . . .
    Then add 1×4 battens on a diagonal and gapped to provide a ventilating channel from the eaves to the ridge The standing seam metal roof clips attach to the battens In my mind, this allows for two things 1) It provides a thermal break from the metal
  • Standing-Seam Metal Roof Options - GreenBuildingAdvisor
    All rafters 16″ OC, decking is 7 16” zip sheathing that will be taped, etc Attic will be unvented OC spray foam directly on the underside of the roof decking HVAC system entirely inside the unvented attic No insulation above the roof deck (doesn’t happen around here) Roofer has given me three options for a standing seam metal roof
  • Is sheathing a metal roof necessary? - GreenBuildingAdvisor
    I'm a carpenter here in Asheville,NC zone 4 5 and trying to design a home for myself so I need to make it as inexpensive and green as possible I'm thinking of a shed roof using flat trusses with blown cellulose to R-60 and a metal roof Of coarse, there will be eave and "ridge" vents So do I need to sheath the roof for metal or will just using purl-ins work My main concern in condensation
  • Proper metal roof installation. - GreenBuildingAdvisor
    We are building a new home in Southeastern Pennsylvania We are having a Drexel Metal standing seam metal roof installed over plywood sheathing The attic is unconditioned space with blown in insulation to a value of R-60 or so Should the metal roofing be installed over strapping We will have a vented soffit for air circulation when discussing with the roofing contractor he is adamant that
  • Sheathing under metal roof - GreenBuildingAdvisor
    Lets pretend the roof design details are conventional and so the roof deck sheathing will be 5 8" to 3 4" Many metal roofing dealers specify minimum of 7 16" sheathing Design depends on type of metal roof: exposed or hidden fasteners; board and batten (pan and ridge) panels; shake and shingle panels; panel or tile system; standing seam; etc
  • R-Value of Metal Roofs - GreenBuildingAdvisor
    A metal roof carries no R-Value It's a 24-26 gauge piece of metal so it has no R-Value One can get a "cool roof" color that helps reflect some of the suns heat gain but that does not provide any R-Value
  • Metal Roof Fasteners backing out - GreenBuildingAdvisor
    Hi Martin Holladay I was reading Fine Homebuilding March 2015 and found the article about through fastened metal roofing A friend of mine was asking about screws backing out of his roof and I was curious about your opinion about the cause and the fix His house is in an area that receives 1-3 feet of snow per winter Snow usually stays for several weeks The metal roof has screws that have
  • Metal roof over unvented, spray foam attic - GreenBuildingAdvisor
    Most metal roof manufactuers require a synthetic underlayment as slip sheet, I would go with whatever the manufactuer recommends Being unveted, your roof doesn't need to "breathe" Most metal roof profiles have decent channels as part of the profile and unless you really go out your way to seal it up, it will allow for a small amount of drying





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