Rim Joist Insulation Advice - DIY Home Improvement Forum
Nov 25, 2024 · Only 1/2" drywall or 23/32" ply/OSB is approved. However, ONLY in rim joist spaces, you can leave foam exposed if it meets certain criteria (less than 3 1/4" thick with density and flame/smoke ratings under limits). Most XPS will meet these. However however, you stated the ceiling was painted black, which insinuates an open ceiling.
Insulating "Rim Joist" that runs along entire wall and is nearly ...
Dec 25, 2024 · This leaves the North and South "rim joists" nearly inaccessible. Local AHJ said to not worry about properly insulating these joist bay/rim joists due to their inaccessibility. She said to use fire-rated canned foam to close off the 3/8" (at most) gap between the interior edge of the sill plate and the last interior joist.
Rim Joist Insulation Best Option - DIY Home Improvement Forum
Feb 9, 2014 · Exterior insulation is effective in controlling winter rim joist condensation but tends to exacerbate summer condensation conditions, particularly in the presence of an interior vapor retarder. With the absence of interior batt insulation and an interior vapor retarder, the negative consequences of exterior rim joist insulation are mitigated.
Insulating Basement Walls and Rim Joist with Polyiso
Jan 2, 2024 · For the rim joist, i was going to remove the fiberglass batts that are in there and vacuum them out. I am going to use dynaflex caulk to caulk all the seams and penetrations. Then stuff with mineral wool batts. You do not want an air permeable material directly against the inside of the rim joist if there is no outside insulation.
Cutting I-joist, replacing cutout | DIY Home Improvement Forum
Nov 29, 2024 · The way floor joists fell, the second to last floor joist on the north side runs atop this framed wall. Approximately 12" outside of that is my north rim joist. In the cavity between rim joist and first "inside" joist (on that framed wall) blown in insulation was compacted so much it provides next to no insulative properties.
Crawl space insulation, rim joist | DIY Home Improvement Forum
Jun 2, 2023 · Floor joist bay insulation butts into the rim. Better if you air seal though all depends on your climate, indoor conditioning, kind of crawl space. If unconditioned space, I don't think there's any need to insulate the rim. You may want to seal the joist bays with house wrap. Separate the insulation from air movement as much as you can.
Rim Joist, Sill Plate, Block Wall Insulation
Aug 22, 2024 · The spray foam cans used just for annular spaces (gaps) can remain exposed. The rigid insulation board needs the thermal cover. You will physically feel much more noticeable results from your air sealing and insulating the rim joist area both in the basement and upstairs than you would from insulating the basement walls.
Rim Joist Insulation - DIY Home Improvement Forum
Apr 22, 2023 · Want to complete the rim joist insulation properly and then drywall the ceiling and walls. Builder sprayed 1 plus inches around perimeter and 3/8" to 3/4" in the center of each rim joist. It seems the intent was to seal the joints and then some residual over spray in the center.
rim joist insulation worth it? - DIY Home Improvement Forum
Nov 18, 2022 · After insulating the rim joist with Owens Corning Foamular rigid foam boards and Great Stuff, as well as closing off and sealing the two vents on either side, the temperature now stays around 63 degrees all year round.
What type of insulation for basement rim joist?
Nov 20, 2009 · What you are most worried about at the rim joist (between insulation and air infiltration) is air infiltration; at least it is in cold zones, where I trust you are located. It is typically an under-insulated and leaky area and is well-known for letting air - warm or cold - through it.