0774783423614

Roxul

Model RXCB351525

Internet #202090820

Store SKU #974419

ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)

  • Maintains R-Value year after year
  • Fire Resistant & Water Repellent
  • Ease of Installation - Cuts Easily & Friction Fits

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Product Overview

Roxul ComfortBatt R-15 Fire Resistant Thermal Home Insulation. Whether you are building new or renovating your home, use Roxul ComfortBatt Thermal Home Insulation in your exterior walls, attic, ceiling and floor frames for top thermal performance. With its high density, non-directional fiber structure and unique flexible edge, Roxul ComfortBatt is designed to deliver a better fit providing heating and cooling energy savings.

  • For 2 in. x 4 in. exterior wood frame walls at 16 in. on center, attics and crawl spaces
  • Resistant to water, rot, mold, mildew and bacterial growth
  • Bag coverage: 59.7 sq. ft.
  • Completely fills wall cavity to eliminate gaps and voids
  • Friction fit batts conform to normal variations in stud centers caused by distortion or warping
  • Flexible edge springs back, expanding the batt against the frame studs to provide a complete fill
  • Made from natural rock
  • Greenguard gold certified for indoor air quality
  • Installation Breakdown:

    basement wall R-15 installation breakdown



  • enviornmental

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ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)

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This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
 
3 answers

If I double this will it equal R30?

This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
Asked by
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May 12, 2016
Will putting two layers of the R15 in a cavity make it equal R30 if there is no air gap between them?
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Asked by
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September 3, 2016
Answer: 
Why don't you get the R30 Batts for 2x8 attics
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Asked by
Massachusetts
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Home Improvement Profile: Professional
June 10, 2016
Answer: 
Dear Color23: First, Roxul ComfortBatt is an excellent insulation product -- non-flammable, with almost as much R value per inch as foam board. Roxul also makes a 'board' version that can be installed just like foam board, e.g. over studs, rafters or joists. See: Roxul Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089.
Regarding two layers = R30, the answer is actually more Read More
Dear Color23: First, Roxul ComfortBatt is an excellent insulation product -- non-flammable, with almost as much R value per inch as foam board. Roxul also makes a 'board' version that can be installed just like foam board, e.g. over studs, rafters or joists. See: Roxul Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089.
Regarding two layers = R30, the answer is actually more complex. The true R value depends on the assembly. Exposed wood and air leaks are two common factors. In a roof with 2 x 8 rafters, for example, you could fill the rafter bays with two layers of ComfortBatt (or other insulation), but if the edges of the rafters are still exposed, this creates a "thermal bridge" because wood is a surprisingly good conductor of heat/cold. Similarly, walls and roofs that are tightly air sealed with a layer of spray foam perform significantly better -- even if other insulation is used for the bulk of the R value.

So look for ways to block every air leak before you install any insulation -- and look for ways to completely isolate any wood that is linked to the exterior, e.g. studs and rafters.
I hope this is helpful.

Mark
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May 12, 2016
Answer: 
Hello Color23,
Yes, 2x the thickness will double the r value.
Thank you for your inquiry.
Charlotte of the Home Depot Community.
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This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
 
2 answers

Running Utilities through Wall

This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
Asked by
California
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March 10, 2016
What about when you have Electrical & Plumbing running through the walls Horizontally and Vertically. Often Electrical holes are drilled through the center of the stud to allow for outlets and switches.
Please advise,
Thanks,
Rocky
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Asked by
Massachusetts
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Home Improvement Profile: Professional
May 6, 2016
Answer: 
Dear Rocky: Roxul rock wool is much denser than fiberglass and molds kind of like clay. It is easy to cut or tear, e.g. to stuff into the space behind a pipe, or to create a gap for an electric line.
Remember that firestopping is required in the studs and top/bottom plate, wherever a hole is drilled for a pipe or electric line -- to block the ability of flame to move between stud bays or between Read More
Dear Rocky: Roxul rock wool is much denser than fiberglass and molds kind of like clay. It is easy to cut or tear, e.g. to stuff into the space behind a pipe, or to create a gap for an electric line.
Remember that firestopping is required in the studs and top/bottom plate, wherever a hole is drilled for a pipe or electric line -- to block the ability of flame to move between stud bays or between floors. DO NOT use 'fireblock' foam, which is actually very flammable and will ignite at just 240 degrees F -- a lower ignition point than wood! Fire resistant caulk is much better, and the only solution approved for commercial construction. We use 3M Model # CP-25WB+, Home Depot Internet # 100166701 Store SKU # 163096.
I hope this is helpful.
Mark Read Less
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March 14, 2016
Answer: 
You can slice into the batt to slip around wiring or pipework, or cut a V Groove to accommodate this. Use a serrated blade to trim material, even a bread knife will cut quite easily.
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This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
 
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Can I get it in 2"

This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
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eagan, MN
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March 2, 2016
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Asked by
Massachusetts
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May 6, 2016
Answer: 
Dear Keith: It sounds like Roxul ComfortBoard would be a better solution for you. This board-like version is similar to foam board -- but non-flammable. See: Roxul Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089, which is 1.5" thick, with R6 performance.
I hope this is helpful.
Mark
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March 4, 2016
Answer: 
No. COMFORTBATT starts at a 3.5" thickness for wood stud dimensions. The only other batt insulation which would be available as a 2" product is AFB which is the commercial version of SAFEnSOUND. This would be available through commercial distributors. Please respond to contactus@roxul.com and we can advise you of local commercial distributor contacts.
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This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
 
2 answers

Add exterior insulation+new siding on old, thin walls?

This question is from ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
Asked by
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January 2, 2016
==The situation:
We want to add more insulation and metal siding, externally, on existing, intact, exterior walls.
This is a 1979 tract house built barely to Code, then.
Climate is cool, moist [PNW], except during fairly short summer, when that reverses.
Any vapor barrier is behind the interior wallboard.
Present walls are barely 2x4 frame, with barely any insulation; siding is older T-111 [?] ply.
==The Plan so far:
We want to avoid opening the walls.
We think we can make regularly-framed 4'x8' sections, fill those with Non-faced Roxul, cover outside face 1st with a 1-way permeable membrane like Tyvek, then cover the outside surface with metal.
Then, mount those section assemblies onto the existing exterior wall faces.
The Roxul on the interior face, would contact the existing old siding.
Since the Roxul is non-faced, it seems this should still allow the walls to breath well, and avoid any mold growing on the old-siding which stays in place.
We would caulk or foam-seal around each assembly perimeter as it was mounted to prevent rain getting behind the box assemblies.
==Why?
Because this allows us to accomplish a section at a time, as able.
==Question:
What say the experts of this plan?
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Asked by
Massachusetts
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May 6, 2016
Answer: 
Dear Chimonger: Roxul is a great solution for many applications because it provides R4 insulation performance per inch, does not absorb water and is non-flammable.
We recently completed a project similar to yours, and the best option is to: (A) install housewrap, e.g. Tyvek, to block water and reduce air leaks. (B) Then install a couple of layers of Roxul ComfortBoard sheathing, rather than the batt Read More
Dear Chimonger: Roxul is a great solution for many applications because it provides R4 insulation performance per inch, does not absorb water and is non-flammable.
We recently completed a project similar to yours, and the best option is to: (A) install housewrap, e.g. Tyvek, to block water and reduce air leaks. (B) Then install a couple of layers of Roxul ComfortBoard sheathing, rather than the batt product. See: Roxul Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089. Similar to foam board, you can simply screw the panels to your existing siding. This will eliminate the need to build the 2x wood 'frames' you noted.
To mount your new siding, install vertical pieces of 1" x 3" strapping on top of the Roxul sheathing. A photo is attached of a similar project where we used foam board. Wood strapping is being installed on top, for the new siding.
With the additional layer of exterior insulation, you will need to trim-out your windows. A tip: Use Veranda PVC trim instead of wood. It never rots and never needs to be painted, and is easy to cut and install, just like wood. See: Veranda Model # H190OWS3, Home Depot Internet # 100244007 Store SKU # 254294 Another tip: assemble your new trim on a work table -- not on the house. Build it like a frame for a painting, then mount it on the window. Use AZEK PVC trim glue to connect corners etc.; the joints are very strong. Hold the pieces in place as the glue cures with clamps. Always use stainless trim screws for installation.
This will also allow you to work on a section at a time, as you noted.
I hope this is helpful,
Mark Read Less
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January 4, 2016
Answer: 
Firstly, we would not have a tested assembly such as this to provide results on. ROXUL is a rock based mineral fibre insulation, which is water resistant but vapour permeable, so in the event it becomes damp or wet, when allowed to dry out it will retain its original performance characteristics. It is also inorganic so provides no food source for mold to grow. Can you please send your inquiry detail to Read More
Firstly, we would not have a tested assembly such as this to provide results on. ROXUL is a rock based mineral fibre insulation, which is water resistant but vapour permeable, so in the event it becomes damp or wet, when allowed to dry out it will retain its original performance characteristics. It is also inorganic so provides no food source for mold to grow. Can you please send your inquiry detail to our webmail contactus@roxul.com. We can then make further recommendation. Thanks Read Less
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Customer Reviews

Rated 4.8 out of 5 by 278 reviewers.
Rated 5.0 out of 5.0 by This stuff rocks.. I've used this product in several different applications. It works fine and is much easier to work with than fiberglass insulation. It tears easily to fit into unusual spaces as needed. My only complaint is that it is significantly more expensive than some of the other options. I'm not sure I would use it to do an entire house but for targeted applications, it's great. August 6, 2016
Rated 5.0 out of 5.0 by Outstanding Product Easy to install and very efficient in terms of limited waste. You will be satisfied, I purchased in bulk and the square foot price beat the competition locally by $0.15 or about 23% August 9, 2016
Rated 5.0 out of 5.0 by Super easy installation, insulates great Noticed an immediate benefit in the garage where I installed this insulation. It was extremely easy to install as it stays in place once you fit it in between the studs. August 16, 2016
Rated 5.0 out of 5.0 by excellent Currently in the middle of finishing my basement framing. Ive been limited to working only an hour or two at a time on weekends as the noise is too much for after hours. We have a few ducts that run directly from basement to the 2nd floor that I figured were the noise pollution culprits. I put around 3 layers into the joist cavity completely sealing off the duct run. While it is not sound proof there is a noticable difference. After going through the 3 ducts leading to our room and the babys room, i now have wife approval to work after the kid is in bed. Well worth the money. Im going to be using this in the wall cavity and joists above the entertainment room as well as a few other places. I was really skeptical after doing plenty of research online, but this worked like a charm. Note that my local store didnt carry the safe and sound, but this certainly did the trick. January 3, 2016
Rated 5.0 out of 5.0 by Rock Wool Is So much Better! Purchased a home on the Connecticut Coast built in 1930. Home has no insulation at all. Roxul has a higher R value, better sound proofing and is a great Fire Stop! It is very easy to work with. I found an old bread knife to cut it with and after a very short time got the hang of cutting it! Roxul doesn't have the flying particles and dust like Fiberglass. I find it not to be itchy at all! Once the inside walls were opened up and the Roxul was installed, the sounds from outside greatly diminished. It fits so nice between the studs and stays put where it's placed! Take your time cutting for wires and outlet boxes and you end up with a tight insulation job! The video on their web site helped too! After the Roxul I added 1" Polyiso foam board and then sheet rock to give me an R value of R21! January 27, 2016
Rated 4.0 out of 5.0 by Good stuff, but inconsistant I have to agree with the inconsistency issues. I bought 3 packages for my mud room. 2 packages were were great, but the 3rd was not nearly as firm, and fell apart a lot easier. Almost like they used less of whatever it is that holds this together on the 3rd bag. Much easier to work with than fiberglass. A cheap electric carving knife makes cutting the stuff almost fun! July 21, 2016
Rated 5.0 out of 5.0 by Better than fiberglass Very easy to install and cut with a bread knife. Only downside is it more time consuming to install than typical fiberglass and the price difference. However no staples are required. Works extremely well as a sound dampening device. December 2, 2014
Rated 5.0 out of 5.0 by great product Excellent sound barrier, easy to cut and install, tools required rubber gloves and bread knife,tighter fit in wall cavity, higher r value over fiberglass insulation July 3, 2013
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