Model # RXCB351525

Internet #202090820

Store SKU #974419

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

ROCKWOOL

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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Frequently Bought Together

Product Overview

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

Product Overview

  • Maintains R-Value year after year
  • Fire Resistant & Water Repellent
  • Ease of Installation - Cuts Easily & Friction Fits
Model #: RXCB351525
Sku #: 974419
Internet #: 202090820

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

Info & Guides

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Specifications

Dimensions

Coverage Area (sq. ft.)
59.7
Product Length (ft.)
3.91 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
47

Details

Faced or Unfaced
Unfaced
Insulation Location
2x4 Walls,Attics,Basements,Ceilings,Crawlspaces,Floors
Insulation R-Value
R15
Insulation Type
Mineral Wool Insulation
Product Weight (lb.)
48.9lb
Returnable
90-Day
Roll or Batt
Batt

Warranty / Certifications

Warranty Information
No

Specifications

Dimensions

Coverage Area (sq. ft.)
59.7
Product Length (ft.)
3.91 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
47

Details

Faced or Unfaced
Unfaced
Insulation Location
2x4 Walls,Attics,Basements,Ceilings,Crawlspaces,Floors
Insulation R-Value
R15
Insulation Type
Mineral Wool Insulation
Product Weight (lb.)
48.9lb
Returnable
90-Day
Roll or Batt
Batt

Warranty / Certifications

Warranty Information
No

Questions & Answers

For basement finishing, im insulating block walls with foam board, then framing over it with roxul between stud voids,

then drywall. Is vapor barrier needed between drywall and roxul?
Asked by: Jem
NO....A vapor barrier is to prevent warm air from getting to a cold surface and condensing. That's it's main job ! Since you have foam insulation glued to your concrete walls, the air getting thru the Roxul will not see a surface cold enough to condense against. If you have foam board (properly sealed), when you install Roxul over that NO VAPOR BARRIER IS NEEDED.
Answered by: MN
Date published: 2018-03-20

Hi I am looking to replace old fiberglass insulation in my attic floor Would this be a good option vs traditional fiberglass?

Asked by: EK
You can use it in an attic, but I don't believe there is any real advantage to using this over other insulation types for an attic. One small advantage is that mice don't like it. The bales are large and heavy and might be hard to get up a typical attic hatch or stairway, although you could open the bale and take a few batts up at a time. Kind of a pain though. By far the most important thing to take care of if you are redoing the attic insulation is to do good air sealing. All cracks, joints and penetrations in the ceiling should be sealed with sealant or foam. Can lights should have insulated boxes built over them. Second most important thing is to ensure proper ventilation, with eave vents and ridge vents. If you take care of those items, then it almost doesn't matter what type of insulation you use as long as you use enough of it to get the recommended R-value for your area. I will say that working with Rockwool is less "itchy" than working with fiberglass.
Answered by: PF
Date published: 2018-08-09

what product to use as vapor barrier?

I want to use the Roxul product in my garage attic. the garage ceiling has drywall and no existing insulation. I'm in Central Ohio and typically vapor barrier are required. None of the Roxul products seem to be Kraft faced as is typical with standard fiberglass insulation. So, any comments on vapor barrier between drywall and the Roxul Batts or would there be a vapor barrier that goes on top of the Batts and the batts are directly laying on the drywall ceiling?
Asked by: GLo
We use Membrain plastic sheeting by Certainteed as a vapor barrier on interior walls (more about unheated spaces like yours, below). We have used Membrain for more than a decade as it is easy to work with and comes in a roll. It has tiny pinholes that allow for a bit of breathing within the wall structure itself. For vertical walls, we set Roxul to the exterior side, then attach entire swaths of the sheeting (takes two people; otherwise, you get bunching and folds) to the interior side of the studs, then sheetrock over that. For a cathedral ceiling, we leave a one-inch space between the Roxul and the roof's plywood underlayment, and then install Roxul to R-40 or so, and then staple sheeting to the ceiling joists over that, then sheetrock. For ceilings with sheetrock already, and just a crawlspace or attic above, it is our understanding from various research that there should be no vapor barrier on top of the Roxul batts laid on top of the sheetrocked ceiling. Roxul batts are made of mineral wool and don't support moisture like, say, recycled jeans (shredded cotton) can. You can do some more research on your own, but my carpenter would tell you not to use any vapor barrier in your situation as he told us not to use it when we insulated our unheated, open-to-the-elements-but-covered-by-a-roof front-porch ceiling which shares a few feet of the interior foyer space. PS Have never seen Membrain sold at Home Depot stores nor on its website; we bought it from a local distributor.
Answered by: snug88
Date published: 2018-03-28

How big is the bag it comes in

Asked by: Den
The R-15 Rockwool ComfortBatt bag measures 48 inches long, by 15.5 inches wide by 27" thick (or 27 inches tall when you look at this photo). (The 27 inches runs perpendicular to the printing on the bag). We have found that the bag can be somewhat compressed to fit into a space with tighter dimensions during transport. We managed to fit three across, inside an '87 Volvo station wagon, setting just like you see them in this photo. We fit six on top of the roof rack, using long straps to secure to the rack ends. (Note: The weight temporarily dented the roof metal in the middle, but it popped back out on its own because Volvo metal is like tank metal. I would not recommend putting more than the number of pounds your car's or SUV's manual says can go onto a roof rack.) We have rented a 15-foot trailer to haul bags of ComfortBatts, but I think we could only fit 8 bags into that trailer. If you use a trailer, you have to secure them with a tarp and rope. When we carry them on top of our Volvo wagon, only the strapping is needed to hold them securely in place, no tarp.
Answered by: snug88
Date published: 2018-04-12
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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 549.
Rated 5 out of 5 by from Prefer rock wool insulation Having finally found a vendor in the local area that would sell it, I use nothing else. It doesn't mold. Air and moisture do not as readily move thru material as such do fiberglass. Bugs don't appear to like the stuff. R value per inch provides better insulation in remodel of structures with 2x4 walls without resorting to scabbing 2x2s or double-walling exterior walls.
Date published: 2018-07-15
Rated 5 out of 5 by from Works great in our 1942 house! We had the old insulation vacuumed out of our attic, to get the house re-wired. There's still some to do, so some of the attic is uninsulated at this time. This has actually been interesting, despite the high temps where we live, because we can measure the effects of different amounts of insulation. The first layer is the R15, to the top of the joists. The entire attic will have this. For some areas, this is ALL that will be there, because my husband wants to be able to access some areas, so there will be sub-floor on the joists for that. The rest will have either ONE layer of comfortbatt (~R12) perpendicular to the first layer, or TWO layers. Using an IR thermometer, we've been measuring the ceiling from inside the house, to see the effects of the insulation, whether one, two, or three layers, and the area that is currently uninsulated. Bear in mind, there is a "north side" and "south side," and part of the south side of the roof has solar panels. On a 100 F day: The ceiling on the north side varies from 78 to 79 degrees where there is three layers (~R39--that is, R15+R12+R12). Where there is two layers, it varies from 79 to 80 degrees. Where there is only one layer (R15), it is 80 to 81 degrees. Not bad at all, right? The ceiling on the south side varies from 79 to 80 degrees where there is three layers. Where there is two layers, it varies from 80 to 82 degrees. Where there is only one layer, it is 81 to 83 degrees. Where there is NO insulation, it varies from 83 to 99 degrees (at the extreme south end)--either I'm hitting an area wth partial insulation or the solar panels are having an effect. We're noticing a significant effect on our electrical use compared to last year, since the AC is on more with this weather. It's MUCH easier to cool a house to 75 F when the ceiling itself is no more than 80 F or so, than when it's 100 F. We are VERY happy we chose this product. It was easy to install. The hardest part was getting it up to the attic!
Date published: 2018-07-04
Rated 5 out of 5 by from The amount of sound reduction is immediately noticed So far, I have bought 5 packages of the comfortbatt to finish my garage and I don't have plans to stop there. I am insulating and finishing our 2 car garage and when just one wall was insulated the noise reduction was already very noticeable! It is easy to cut, easy to install, easy to notice a positive difference! I am already planning on using the safe'n'sound on my next project. The only complaint I have is that for as heavy as the packages are the bags tear too easily trying to load and unload them. But, if that is my worst complaint I think I can manage. Going to enjoy the benefits of this insulation for years to come!
Date published: 2018-07-21
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 This should make regular fiberglass insulation obsolete I'm remodeling my 1950 mid century modern home one room at a time. I started with the hardest room to heat & cool, knocked out the old plaster & had the room sprayed with rigid & soft foam. The guys rushed the job & left some thin spots and even bare wood showing thru. I wanted to fill voids with Roxul but could not find it anywhere in Oklahoma so I hung the drywall anyway. Since then I've found a dealer 30 miles from me that can order it. I've since used Roxul in my sun room & garage. I like it better than the foam & I can easily install it myself.
Date published: 2018-07-19
Rated 5 out of 5 by from I am not going back to fiberglass. This stuff is awesome. Although more costly than fiberglass, this stuff is way better. Just the fire resistance alone should sell you on this product. It's no where near as itchy as fiberglass, the r-value is better than r-13, it holds it's shape way better, and the sound deadening properties are noticeable instantly. I cut it with my serrated bread knife from the kitchen, without ruining it at all, and it cuts better than bread! Cutting around outlet boxes is just too easy. My wife was intimidated at first, but when she saw how much easier to cut it was, she was actually having fun doing it! I also feel better about it's resistance to moisture, since no house is built completely air/water tight. This stuff will pay for itself anyway in the long run and I strongly recommend it. I ordered mine online and the store had it all loaded on a flat cart in no time at all. A+
Date published: 2012-05-15
Rated 4 out of 5 by from Great product. This is a great product. Living in Florida I especially like the fact that it does not rot or promote growth of of fungi or mildew and it is moisture and water resistant.
Date published: 2018-09-15
Rated 5 out of 5 by from Absolutely will buy again. I am in the middle of a full renovation and have used Roxsul in my attic. I plan on finishing walls with Roxsul also. Very happy overall with product.
Date published: 2018-07-07
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