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ROCKWOOL
Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack)

Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack)

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$124.99at Hemlock HardwareChecked 22 h ago

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Price facts

  • Last seen at $124.99 at Hemlock Hardware on Nov 14.

Our take on the Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack)

Comfortbatt R-23 is a semi-rigid stone wool batt for 2x6 wood stud walls, joists, attics and floors. Its flexible edge compresses during install and springs back against the studs, filling gaps from warped or off-center framing so the rated R-value holds. Stone wool is non-combustible, resists moisture and rot, and absorbs sound well, which sets it apart from fiberglass batts that need more careful fitting and handle water poorly. It suits builders and renovators framing with 2x6 lumber who want dependable thermal and acoustic performance; the trade-offs are higher weight and a firmer, denser batt than fiberglass.

Best for2x6 wood-stud exterior wallsAttics, ceilings and floor framesSound control between roomsRenovations with uneven or warped studs
Pros
  • Flexible edge expands to fill gaps at studs
  • Holds rated R-value despite framing variation
  • Non-combustible stone wool
  • Excellent sound absorption
  • Resists moisture, rot and mildew
  • Cuts easily with a saw or knife
Cons
  • Heavier and denser than fiberglass batts
  • Firmer batts take more effort to compress into cavities
  • Stone wool fibers and dust call for gloves, eye protection and a mask
  • Costs more than basic fiberglass of similar R-value

Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack) prices at every store

  • Hemlock HardwareNew

    In stockReturn policy

    $124.99Checked 22 h ago
    Visit Hemlock Hardware

About the Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack)

Rockwool Comfortbatt is a stone wool insulation batt for wood studs and joists. It is used in new residential construction and in renovations, and it fits walls, attics, ceilings and floor frames.

The batt is semi-rigid with a flexible edge. The edge compresses as the batt is inserted into the frame, then springs back to expand against the studs for a complete fill. This lets the batt make up for normal variations in stud spacing caused by distortion or warping, so the expected R-value is achieved.

The insulation cuts easily and is non-combustible. It absorbs sound well, absorbs little moisture and resists water. It does not rot or promote the growth of fungi or mildew. It is made from natural and recycled materials, and both the product and the process are CFC and HCFC free. It can contribute to earning LEED points.

Material
Stone wool, made from natural and recycled materials
R-value
R-23
Batt size
24 in. x 47 in.
Pack size
5 batts
Frame type
Wood studs and joists
Applications
Walls, attics, ceilings and floor frames
Fire rating
Non-combustible
Moisture
Low moisture absorption; water resistant
Sound
Excellent sound absorbency
Environmental
CFC and HCFC free; can contribute to LEED points

Questions and answers

What does R-23 mean and where does it fit?
R-23 is the thermal resistance rating, matched to 2x6 framing. It is typically used in exterior walls, and also in attics, ceilings and floors where that cavity depth applies.
How is it different from fiberglass batts?
Stone wool is denser, non-combustible and handles moisture better, and it absorbs sound more effectively. Fiberglass is lighter and usually less expensive but needs careful fitting to hit its rated R-value.
Does the flexible edge really matter?
Yes. The edge compresses as you push the batt in and springs back against the studs, covering gaps from warped or off-center framing. That helps the installed batt reach its expected R-value.
Can it get wet or grow mold?
The stone wool resists water and does not rot or promote fungi and mildew growth. It has low moisture absorption, though it should still be kept dry before installation.
How do I cut it?
It cuts easily with a insulation saw or a sharp utility knife. A straight edge helps for clean cuts around outlets and framing.
What is in the pack?
The pack contains five Comfortbatt R-23 batts sized for 24 in. by 47 in. framing bays. Check your stud spacing and cavity depth before ordering.
Where is the Rockwool Comfortbatt R-23 24 In. x 47 In. Stone Wool Insulation (5-Pack) cheapest?
At Hemlock Hardware, for $124.99, as of our latest check.

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