Model # RXCB351525

Internet #202090820

Store SKU #974419

Roxul ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll)
0774783423614

Roxul

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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Customer Questions & Answers

20 Questions36 Answers

Customer Questions & Answers

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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4 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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September 20, 2016
Answer: 
YES, but do not compress...
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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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3 answers

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)
Asked by
eagan, MN
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March 2, 2016
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October 27, 2016
Answer: 
You "could" do it by slicing the thickness in half, but, depending on how large an area you need to work with, it could be a real pain. I don't know if Home Depot carries it, but Roxul does make a product called "Cavity Rock" that is thinner.
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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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3 answers

For interior wall sound deadening will the 3.5" batts perform better the the 3" batts sold as Roxul Safe'n'Sound?

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
Wichita, KS USA
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November 22, 2015
I also have a 6 inch wall at another location. Will the regular Roxul R23 batts which are 5.5 thick deaden sound better than the 3 inch Safe'n'Sound? Roxul does not advertise sound values.
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Asked by
Wapp. Falls NY
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September 20, 2016
Answer: 
Safe'n'Sound is a product which is merely more dense than Comfortbatt & hence the 1/2" or more air gap does not allow sound propagation by surface to surface contact. Comfortbatt will conduct "some" sound because of contact between two wall surfaces.
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November 24, 2015
Answer: 
COMFORTBATT is tested in assemblies for thermal properties and SAFEnSOUND is tested in assemblies for sound properties. Both products are manufactured from the same base materials, Basalt and Slag. Both will give some sound and thermal properties.
3.5" versus 3" may be similar, 5.5" versus 3" in a 2x6. We would expect a better sound result as you will have 2.5" more material in the assembly.
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Asked by
Massachusetts
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November 24, 2015
Answer: 
Dear AcousticBarrier: No. Safe 'n Sound is specially formulated to suppress sound, in addition to thermal insulation. The R values are virtually identical, so pick Safe 'n Sound.
Roxul does provide sound suppression data for Safe 'n Sound. You can find it on their website. They also offer other versions of their sound suppression and insulation products that can be very helpful, e.,g. ComfortBoard with Read More
Dear AcousticBarrier: No. Safe 'n Sound is specially formulated to suppress sound, in addition to thermal insulation. The R values are virtually identical, so pick Safe 'n Sound.
Roxul does provide sound suppression data for Safe 'n Sound. You can find it on their website. They also offer other versions of their sound suppression and insulation products that can be very helpful, e.,g. ComfortBoard with poly or foil facing. You can order these options via your Home Depot Pro or Customer Service desk.
I hope this is helpful.
Mark Read Less
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2 answers

Would this work under an enclosed porch in Ohio

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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September 2, 2016
N/a
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Asked by
Massachusetts
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September 21, 2016
Answer: 
Dear Del: Yes, depending on how your enclosed porch is constructed. If there is a crawl space underneath, for example, you could fill the joist bays with Roxul. Use Simpson insulation wire to hold the batts in place. See: Simpson Strong-Tie Model IS16-R100, Home Depot Internet #100375163 Store SKU #594333 Store SO SKU #592854

It would also be a good idea to cover the joists with a layer of Tuff-R
Read More
Dear Del: Yes, depending on how your enclosed porch is constructed. If there is a crawl space underneath, for example, you could fill the joist bays with Roxul. Use Simpson insulation wire to hold the batts in place. See: Simpson Strong-Tie Model IS16-R100, Home Depot Internet #100375163 Store SKU #594333 Store SO SKU #592854

It would also be a good idea to cover the joists with a layer of Tuff-R foam board. This will break the 'thermal bridges' created by all of the exposed joists, block moisture from the soil and allow you to air-seal the bottom of the porch. See: Super TUFF-R Model 268426, Home Depot Internet #100322374 Store SKU #804395 Store SO SKU #621947. Seal all of the joints and edges to block air leaks. DAP 230 works well for small gaps, and the 'Windows and Doors' version of Great Stuff is good for large gaps and holes.

I hope this is helpful.

Mark
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September 6, 2016
Answer: 
Good morning,
Yes, you can use the ROXUL COMFORTBATT under a porch:
http://www.roxul.com/products/residential/where+to+insulate/homeowner#/exposed_floors/roxul_comfortbatt/product
Thank you.
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Customer Reviews

ComfortBatt 3-1/2 in. x 15-1/4 in. x 47 in. R-15 Fire Resistant Stone Wool Insulation (12-Roll) is rated 4.8 out of 5 by 327.
Rated 4 out of 5 by from I prefer working with Roxul over fiberglass insulation. It's not quite as itchy as fiberglass, b... I prefer working with Roxul over fiberglass insulation. It's not quite as itchy as fiberglass, but it's not itch free either. I always wear a dust mask working with Roxul, because particles become airborne as you work it into place. It fits snugly in wall captivities where standard stud spacing was used, so it appears to provide better protection against air infiltration than fiberglass. For areas where the insulation needs to be cut, it cuts very easily with a bread knife. The only reason I gave it 4 stars instead of 5 is that cutting around electrical boxes and "grooving" for electrical wires is kind of a pain because the material is a bit "crumbly". I especially like the fact that Roxul is fire resistant. Also, I'm sure that people will tell me I'm misinformed, but I don't feel comfortable using foam insulation. I'd be concerned about foam's flammability and its potential for off-gassing. I don't have those concerns with Roxul.
Date published: 2016-10-27
Rated 5 out of 5 by from WHY? Would anyone use fiberglass insulation again? Simply put, Roxul is AMAZING! R_15 value, fire resistant, water resistant, mold & mildew resistant, sound barrier, ZERO WASTE and cuts easily with a serrated knife! NO MASK! NO ITCHING! NO STAPLES! NO BRAINER! Insulated a 112 sq/ft wall in 20 minutes! Sure it is a few dollars more than the pink stuff, but if you ever insulated an area with the pink stuff, you know the prep, the aggravation and the clean up. I will never buy the pink stuff again. **TIP** Use a framing square to make straight cuts with a serrated bread knife in a sawing motion. Stack cut pieces.
Date published: 2016-10-11
Rated 5 out of 5 by from Make Things Right the 1st Time I WILL NEVER BUY FIBERGLASS INSULATION ANY MORE ! ! ! It may cost more but it has a higher R-value & the installation is SO EASY & FAST, no mask, no gloves, no long sleeves, no stapler, no scissors, no razor knife, just a bread knife & T-square. SO SIMPLE... cut slightly oversize & push in place.
Date published: 2016-09-21
Rated 4 out of 5 by from Definitely worth the money! My husbands and I re-finished our basement and added Roxul Comfort batt insulation, it was so easy to cut to size and install and our finished rec room is so comfortable now (This review was collected as part of a promotion.)
Date published: 2016-11-24
Rated 5 out of 5 by from 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%
Date published: 2016-08-09
Rated 5 out of 5 by from ComfortBatt is the Best! My boyfriend and I were remodeling the attic space in our 1950s home. The old insulation was gross and we were finishing the attic to be more useful. We loved the quality of Roxul as we had used the safe and sound previously. Knowing we needed a higher R rating, we chose ComfortBatt as our preferred insulation. It is SO MUCH EASIER and less messy than the pink rolled stuff! We knew we had to make a lot of cuts, since our joists were not 16 on center, and the serrated bread knife is the perfect tool. Would totally recommend this to anyone, do not waste your money on another product. (This review was collected as part of a promotion.)
Date published: 2016-10-28
Rated 5 out of 5 by from When buying any Insulation, Roxul is the name for me! Last summer my wife and I put a new roof on our house and when doing so we found that in the lower parts of the attic there was no insulation at all and very little in the rest of the attic. So we headed off to the closest BMR and grabbed some bags of Roxul Insulation. After the job was all done not only was the house cooler in the summer heat but come winter we found our house to be alot warmer. The other nice thing the hydro bills have gone down somewhat since we made this change. Our next renovation is the back room, and I know we will need more Roxul for that. (This review was collected as part of a promotion.)
Date published: 2016-08-28
Rated 5 out of 5 by from I will never buy fiberglass insulation again Prior to discovering Roxul ComfortBatts, I had used fiberglass batt insulation. Not only does Roxul have all of the pros listed above, it's got a greater R-Value per inch than fiberglass batts, meaning it is easier to get better thermal performance in retrofit installations. It is a little more difficult to find at lumberyards than the fiberglass batts, but it is worth seeking out. While I think the product is a good value, if they could bring the price down a little it would *really* put fiberglass at a competitive disadvantage. (This review was collected as part of a promotion.)
Date published: 2016-11-13
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