Insulating wood I-joists with Roxul - GreenBuildingAdvisor
Nov 21, 2013 · Builder is using wood I-joists 16″ O.C. for the floor. After considerable thought and reading, including comments by Dana Dorsett and research by Washington State University, I decided that an open crawl space would work for me. However, I have insisted that we use good insulation: R-24 (commercial size) stone wool batts by Roxul for the ...
Installing Rigid Foam Between Floor Joists Above Crawlspace
Jan 15, 2018 · Step three: Install a continuous layer of rigid foam on the underside of the the joists. Pay attention to airtightness -- you will want to seal the seams of the rigid foam with high-quality tape. Step four: Install a layer of OSB or plywood to protect the rigid foam from creatures.
Insulating Rim Joists - GreenBuildingAdvisor
Jan 10, 2020 · If your rim joist is uninsulated, the only layers between the rim joist and the outdoors are the sheathing, which is typically between ½ in. and ¾ in. thick, the asphalt felt or housewrap, and the siding. Rim joists are above grade, so it makes sense to insulate them to the same level as above-grade walls—a minimum of R-13 in climate zones ...
Insulating an Exposed Floor - GreenBuildingAdvisor
Apr 8, 2013 · The floor joists are supported by two beams, each a tripled 2×10. To insulate the floor, Mr. Mike put two layers of R-13 unfaced fiberglass batts in the joist cavities, ran a 3/4-in. layer of Cellofoam foil-faced rigid insulation over the bottoms of the joists, then covered the insulation with 1/2-in. oriented strand board (OSB) to keep out pests.
Insulating I-joists in a garage ceiling - GreenBuildingAdvisor
Nov 25, 2016 · With I-joists there is 16″ between the Advantech subfloor and the future sheetrock ceiling, and 13″ in the web area as chords are 2×4’s, with slightly under 12″ between the plywood webs. Current plan is to use Roxul batts cut in half to fit between the joists. Options range from min R30 at 7.25″ thick to max R53 at 12.75″ thick.
Closed-cell spray foam insulation: between rafters or joists?
Oct 19, 2018 · The quote includes 5″ of closed cell foam in both applications. The cost difference is not significant (~$300), and I have read a lot of conflicting advice between the two options. Currently, the attic is vented with fiberglass insulation between the joists. There is no HVAC equipment in the attic, however, we may add central air in the next ...
Insulating at the sill when joists are embedded in concrete?
Mar 11, 2016 · Hi! I have a 70-year-old house in Ontario. The floor joists are fully embedded in a poured concrete foundation (the top of the joist is flush with the top of the foundation). I've read several comments on GBA suggesting that I avoid putting rigid insulation between the joists because it'll make the joist ends colder and more prone to rot (if moisture is somehow getting …
The Best Way to Insulate a Floor - GreenBuildingAdvisor
Jun 2, 2014 · The second method is 1.5-inch (R-10) of sprayed closed-cell foam.”. Not counting his labor to install the mineral wool batts, the cost of either of those options is about $2,000. Because of its thickness, the Roxul would have three times the insulating value of the foam.
Insulating a Wood-Framed Floor Assembly - GreenBuildingAdvisor
Oct 18, 2019 · Most wood-framed floor assemblies — for example, floor joists over a basement — have conditioned space on all sides, and therefore don’t need insulation. Sometimes, though, a wood-framed floor assembly has outdoor air on the underside — as is the case with a house on piers, for example, or the cantilevered floor of a bump-out, or the ...
Insulating around heating ducts running between floor joists
Feb 10, 2017 · Insulating around heating ducts running between floor joists. I’m in the process of renovating an older bungalow home in climate zone 7a. It currently has an unfinished basement but I am in the beginning process of retrofitting this. It is a heated basement and plan to finish it into a living space.