DIY Builds
DIY Builds
Photo: cottonbro studio
Experts usually advise builders that you can't install fiberglass insulation directly against the underside of roof sheathing.
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UPDATED on August 31, 2018 with new information on code changes allowing the use of vapor diffusion ports. Experts usually advise builders that you can’t install fiberglass insulation directly against the underside of roof sheathing. If you want to install fiberglass between your rafters, you have two basic choices: either include a ventilation channel between the top of the fiberglass insulation and the underside of the roof sheathing, or install enough rigid foam above the roof sheathing to keep the roof sheathing above the dew point during the winter. These rules were developed to prevent damp roof sheathing. Most building codes (including the International Residential Code) allow just one exception to these rules: in Climate Zones 2B and 3B, you can install fiberglass insulation against the underside of your roof sheathing without a ventilation channel or rigid foam above the sheathing — but only if you install tile roofing. (This system works because concrete tiles and clay tiles are well ventilated and vapor-permeable, so any moisture that accumulates in the roof sheathing can dry toward the exterior.) The code exception can be found in section R806.5, subsection 5.2, of the 2012 IRC. (Of course, if the owner of such a home decides to re-roof with asphalt shingles, the roof sheathing may begin to rot. But that’s another story.) Owens Corning, a leading manufacturer of fiberglass insulation, is now promoting a package of products — basically blown-in fiberglass insulation and a new type of insulation netting — to create unvented conditioned attics. Owens Corning calls this proprietary insulation method the “ProPink High Performance Conditioned Attic System.”
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Denim insulation is mold-, mildew-, and fungi-resistant.
Next time you pull on a pair of jeans, consider this: You can use denim to keep your house cool in the summer and warm in the winter. Though it costs nearly twice as much as fiberglass, denim insulation (also known as cotton fiber) offers significant advantages over traditional insulation materials. Blue and Green. If sustainability is a priority in your project, you may appreciate that denim insulation is made from post-consumer recycled natural fibers in a low carbon-footprint process. Companies collect old blue jeans and resell the loose fibers to insulation manufacturers. In this way, Bonded Logic, one of the first and largest manufacturers of denim insulation, diverts an estimated 300 tons of the material away from landfills every month. Breathe Easier. Denim can help improve indoor air quality, because it contains no VOCs (volatile organic compounds)—chemicals that may emit polluting gases that contribute to asthma and allergies. Peace and Quiet. Thanks to an acoustic rating that is 30 percent higher than fiberglass, denim insulation contributes to a quieter home environment. Lower Energy Bills. Denim insulation is available in R-values of R-13, R-19, R-21 and R-30, which means that it insulates no less well than cellulose or fiberglass insulation. Hardwearing. Denim insulation is mold-, mildew-, and fungi-resistant. In addition, the product, typically treated with a non-toxic borate solution, boasts a Class A fire rating. Convenience. Though it cannot be blown in, denim insulation comes in perforated batts that are as easily to install, being sized to fit between standard studs and joists.
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