Insulating attic with R-15 and R-23 Rockwool Comfortbatts
Oct 9, 2019 · If we choose Rockwool I think we will need to install 2 layers of batts. R23 in between the joists and R15 overlapping on top, perpendicular to the joists. 1 R23 - 5.5x14x47 ($6.50) + 1 R15 - 3.5x14x47 ($4.30) = $10.80 for two layers.
R-Values of Safe’n’Sound vs. Comfortbatt Rockwool Insulation
Jun 6, 2018 · Both the Rockwool ComfortBatt and JM TempControl have an R-Value of approximately 4.285 per inch (15/3.5). So, assuming the similarly higher density Rockwool Safe and Sound and JM Sound and Fire perform relatively the …
Rockwool R15 vs Safe & Sound Interior Wall - GreenBuildingAdvisor
Sep 26, 2022 · It will work fine, but don't expect massive levels of sound blocking performance. If you have the physical space, a second layer of drywall, ideally 5/8" type X, in additional to the mineral wool between studs will help with sound blocking.
Roxul Insulation Batts - GreenBuildingAdvisor
Dec 29, 2018 · An R30 designed for 2x10s only performs at R25 @ 7.25" thickness of 2x8 framing, whereas an R30 rockwool batt is designed for 2x8s really performs at R30. Even "Cathedral ceiling" HD fiberglass is nominally 8.25", and only performs at …
Rockwool on Backorder - GreenBuildingAdvisor
Nov 14, 2020 · I have finally landed on my cathedral ceiling system. I have site built plywood 1 1/2″ baffles, air sealed, R30 Rockwool, R15 Rockwool (both 24″ o/c), Intello, 2×4’s on edge perpendicular to rafters with R15 on 16o/c with drywall /T&G ceiling. My problem is the R15 24 o/c is on backorder until the end of December.
Mineral Wool Compression Affect on R-Value
Aug 6, 2019 · I'd expect an R15 rock wool batt (R4.3/inch) to perform around R11 when compressed to 2.5" (R4.4/inch) in exactly the same way that R15 fiberglass goes from R4.3/inch at 3.5" to about R4.4/inch when compressed to 2.5", according to …
Seal then flash and Rockwool or just seal and Rockwool.
Mar 25, 2022 · But r10 on the exterior plus r15 Rockwool in the cavity equates to r25 in the cavity and r13 at every stud. Much better overall r value, plus the Rockwool is fireproof when compared to closed cell, also Rockwool is vapor permeable but …
Is Mineral Wool Insulation Worth the Extra Cost?
Nov 1, 2021 · I prefer Rockwool because it is easier to work with, is more resistant to insects and rodents, more durable, hydrophobic - and most of all - because it is much more fire resistant than any other insulation (melts at 2100 degrees F, as opposed to under well 1000 degrees F for any other type of insulation; with a typical house fire around 1100 ...
Hybrid insulation: rockwool + foam board (and canned foam for ...
Jul 20, 2018 · The extra depth should allow for 0.5 to 1inch of foam board + rockwool insulation. put in r15 rockwool vapor retarder or not (not sure as the foam board could be a barrier) drywall. My issues are with the dew point / moisture mold problems. Will this work if not, What is the best way to air tight the stud bays before the rockwool.
Ownes Corning Thermafiber vs. Rockwool Comfortbatt - any …
Jul 28, 2022 · I’m getting ready to insulate my ‘pretty good house’ and considering insulation. The Owens Corning Thermafiber and Rockwool Comfortbatt are close to the same price. The Rockwool has a slightly better R number. Are there good reasons concerning, performance, longevity, or ease of installation to consider one brand over the other?