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

Installation Options

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 Depth (in.)
3.5
Product Height (in.)
15.25
Product Length (ft.)
3.91 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
47

Details

Faced or Unfaced
Unfaced
Formaldehyde Free
No
Insulation Application Type
2x4 Walls,Attics,Basements,Ceilings,Crawlspaces,Floors
Insulation R-Value
15
Insulation Type
Rock Wool
Product Weight (lb.)
48.9lb
Returnable
90-Day
Roll or Batt
Batt
Vapor Retardant
No

Warranty / Certifications

Warranty Information
No

Specifications

Dimensions

Coverage Area (sq. ft.)
59.7
Product Depth (in.)
3.5
Product Height (in.)
15.25
Product Length (ft.)
3.91 ft
Product Thickness (in.)
3.5 in
Product Width (in.)
47

Details

Faced or Unfaced
Unfaced
Formaldehyde Free
No
Insulation Application Type
2x4 Walls,Attics,Basements,Ceilings,Crawlspaces,Floors
Insulation R-Value
15
Insulation Type
Rock Wool
Product Weight (lb.)
48.9lb
Returnable
90-Day
Roll or Batt
Batt
Vapor Retardant
No

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

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

Can this be used as fireblocking material between a top plate and ceiling joists?

Asked by: Bryan
Yes but will need to be cut to size which is really easy. The inspector allowed it in my town
Answered by: Ms
Date published: 2018-01-06
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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 524.
Rated 5 out of 5 by from This stuff is amazing! Rodents do not touch this stuff, it's durable and super easy to instal, keeps it's insulating qualities even if damp, mould resistant, made from natural product and great for cold Canadian winters. I've used it in a few shipping container cabins and they stay cozy warm in winter and cool and comfy in sunmer.
Date published: 2018-03-05
Rated 5 out of 5 by from 130 year old church restoration, ideal product Installing comfort batt insulation in the walls and floor of a 130 year old William Critchlow Harris church/cottage upgrade. As this structure is a 'balloon' design, fire concern was paramount. Simple installation even with so many cuts, and huge long term benefits. Ideal application for your product.
Date published: 2018-03-13
Rated 5 out of 5 by from For many reasons this is probably the best insulation for... For many reasons this is probably the best insulation for existing homes, historic properties & even new construction... It can get wet, it is vapor permeable, it is fireproof, it doesn't off gas, it is easy to use. It has 80 years of proven use.
Date published: 2018-01-04
Rated 5 out of 5 by from We have been buying this again and again We have spent the last few years renovating our home and upgrading everything including the insulation and my wife and I will only use Roxul. (This review was collected as part of a promotion.)
Date published: 2017-11-02
Rated 5 out of 5 by from I would definitely buy this product again! This product was easy to use. It cut easily where we needed to cut it. My basement is so much warmer since installing this insulation. (This review was collected as part of a promotion.)
Date published: 2017-11-07
Rated 5 out of 5 by from Stop shopping and just buy Roxul now My wife and I gave ourselves the unenviable task of replacing the 30 yo pink insulation in our unfinished basement. The several thousand sq. foot project was onerous and the job stretched across several weekends. When my wife and I got rolling on the job, she found Roxul so easy and pain-free to work with that she keep right on charging through the job all alone during the week while I was at work. I can safely say she did 80% of the +2000 sq foot basement on her own. Top props to Roxul for making their product wife friendly!!! Oh ya... the basement is noticeably more comfortable this winter (This review was collected as part of a promotion.)
Date published: 2017-11-30
Rated 5 out of 5 by from We won't use anything but this product in our builds! We do both custom and high volume manufacturing for tiny homes on wheels. It's important to us that the products we spec out to use are easy to install and work effectively for our applications. This product does exactly that. Sounds carry far and wide even in tiny homes. So, when we have new families moving into a small space, this product makes an excellent noise dampener in between closed off rooms to provide an element of privacy where it can normally be hard to find. Nevermind its obvious positives, this product is just far superior at the end of the day. It's our gold standard for each home that we send out of our shop and it makes us proud!
Date published: 2018-03-12
Rated 5 out of 5 by from UNBELIEVABLE!! For 19 years I've closed the passage to my back door through a room addition with a curtain every winter. The room was at least 20 degrees colder than the house all winter. We couldn't leave boots or coats conveniently located to the door. It's just no fun to put icy outerwear on to go outside. 2017 was enough! I couldn't take another year. Research led me to mineral wool. I installed 11 bags of Roxul Comfortbatt R23 in the walls and ceiling. O M G.....IT IS WONDERFUL!!! The addition is a pleasure. I'm thinking it may actually be WARMER than the house now. Thank you so much for making Comfortbatts available to the DIYer. (This review was collected as part of a promotion.)
Date published: 2017-11-20
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