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Deal.ai › Compare

ROCKWOOL Comfortbatt R23 Insulation vs ROCKWOOL Safe'n'Sound

Buy ComfortBatt R23 for exterior 2×6 walls, where its 5.5 in. thickness delivers the thermal R-value the wall needs. Buy Safe'n'Sound for interior partitions where sound control and fire resistance matter more than R-value. ComfortBatt is the thermal product; Safe'n'Sound is the acoustic and fire product. Both are semi-rigid stone wool with friction fit, noncombustible, and rated 0/0 on flame spread and smoke.

  • Choose the ComfortBatt R23 if you are insulating nominal 2×6 exterior walls, attics or exposed floors and need R-23 at 5.5 in.
  • Choose the Safe'n'Sound if you are soundproofing interior walls, ceilings or floors between rooms and want maximum noise dampening with fire resistance.

Prices

  • ROCKWOOL Comfortbatt R23 Insulation: $75.00 at YEARS BUILDING MATERIALS (checked today)
  • ROCKWOOL Safe'n'Sound: $65.00 at Years Building Materials (last seen Nov 9)
  • Difference: the ROCKWOOL Safe'n'Sound is $10.00 cheaper than the ROCKWOOL Comfortbatt R23 Insulation at the latest prices (Nov 9 and Nov 14)
ROCKWOOL
ROCKWOOL RXCB551525 COMFORTBATT R23 5.5 In. X 15.25 In. X 47 In (39.82 SQFT)

ROCKWOOL Comfortbatt R23 Insulation

ROCKWOOL RXCB551525 COMFORTBATT R23 5.5 In. X 15.25 In. X 47 In (39.82 SQFT)

$75.00at YEARS BUILDING MATERIALSChecked 31 min ago
See all prices and details
Visit YEARS BUILDING MATERIALS
Pros
  • R-23 in a 5.5 in. batt for 2×6 exterior walls
  • Semi-rigid with flexible edges for a tight friction fit
  • Noncombustible with 0/0 flame and smoke ratings
  • Covers about 39.8 sq ft per bag
Cons
  • Too thick for 2×4 cavities at full thickness
  • Not the acoustic product; lower NRC than Safe'n'Sound
  • Limited to 16 in. o.c. framing at this width
ROCKWOOL
ROCKWOOL Safe’n’Sound

ROCKWOOL Safe'n'Sound

ROCKWOOL Safe’n’Sound

$65.00at Years Building MaterialsChecked Nov 9
See all prices and details
Visit Years Building Materials
Pros
  • NRC 1.05 for strong sound dampening in interior walls
  • Fits 2×4 framing at 3 in. and 2×6 at 6 in.
  • Noncombustible, melts near 2150°F, 0/0 flame and smoke
  • GREENGUARD Gold certified for indoor air
Cons
  • No thermal R-value rating for exterior wall use
  • 3 in. version leaves a gap in a 2×6 cavity
  • Denser and heavier to handle than ComfortBatt

What separates them

ROCKWOOL Comfortbatt R23 InsulationROCKWOOL Safe'n'Sound
Primary purposeThermal insulation rated R-23 for exterior wallsAcoustic and fire insulation for interior partitions
R-valueR-23 at 5.5 in.Not rated as a thermal batt; sold for sound and fire
Thickness5.5 in., fits nominal 2×6 cavities3 in. (also 6 in.); fits 2×4 and 2×6 framing
Density2 lb/ft³2.4 lb/ft³
Sound absorptionGood stone wool dampening, not the acoustic productNRC 1.05, the higher sound absorption of the two
Fire performanceNoncombustible, 0/0 ASTM E84, melts near 2150°FNoncombustible, 0/0, same melt point, plus GREENGUARD Gold
Framing fit16 in. o.c. wood studs, 2×6 only at full thicknessWood and steel studs, interior partitions

Price history

$83.98$65.00
Nov 7Nov 14
  • ROCKWOOL Safe'n'Sound: lowest $65.00 on Nov 10 at Years Building Materials; $83.98 on Nov 14.

Prices at every store

ROCKWOOL Comfortbatt R23 Insulation

  • YEARS BUILDING MATERIALSNew

    In stockReturn policy

    $75.00Checked 31 min ago
    Visit YEARS BUILDING MATERIALS
Prices and history →

ROCKWOOL Safe'n'Sound

  • Years Building MaterialsNew

    In stock

    $65.00Checked Nov 9
    Visit Years Building Materials
  • The Home DepotNew

    In stock

    $83.98Checked 2 h ago
    Visit The Home Depot
  • The Home DepotNew

    In stock

    $83.98Free shippingChecked Nov 9
    Visit The Home Depot
  • Lowe'sNew

    In stock

    $84.98Free shippingChecked 31 min ago
    Visit Lowe's

Store links may earn us a commission. Some prices via Klarna.

All 10 stores and price history →

Specs compared

SpecROCKWOOL Comfortbatt R23 InsulationROCKWOOL Safe'n'Sound
Length3.9147 in
Width4715-1/4 in
Thickness5-1/23 in
MaterialStone WoolMineral Wool
Density2 lb/ft³2.4 pcf
Smoke Developed Index00
Melting Point1177°C (2150°F)approximately 1177 deg C
R-ValueR23—
Coverage Area39.8—
Temperature Rating2150—
TypeBatt—
Flame Spread Rating0—
Show all 20 specsShow fewer specs
SpecROCKWOOL Comfortbatt R23 InsulationROCKWOOL Safe'n'Sound
Flame Spread Index—0
Application—For Wood Stud Framing
Heat Resistance—over 1,000°C/1842°F
Available Thicknesses—3" and 6”
Certification—UL GREENGUARD Gold Certified
Acoustical Performance—NRC – 1.05
Compliance—Type 1 Compliant Mineral Fiber Thermal Insulati…
Reaction To Fire—Non-combustible

What reviewers say

ROCKWOOL Comfortbatt R23 Insulation

Owners and installers who use stone wool batts like these praise the stiffness, clean cuts and snug fit, and note quieter rooms and better fire peace of mind than fiberglass. Complaints center on weight, dust and the higher cost.

What people mention
  • InstallationPraisedBatts friction-fit between studs and stay in place without fasteners.
  • SoundPraisedOwners report quieter rooms than with fiberglass in the same walls.
  • Fire safetyPraisedNoncombustible stone wool with a 0/0 flame and smoke rating is a common reason buyers choose it.
  • WeightCriticisedHeavier and more tiring to handle than fiberglass batts.

ROCKWOOL Safe'n'Sound

Owners and contractors rate it highly for cutting noise between rooms and floors, and several mention it helped pass fire inspections. Complaints center on cost, weight and the itch and dust during installation.

What people mention
  • Sound dampeningPraisedOwners say it visibly reduces noise transfer through shared walls and floors.
  • Fire resistancePraisedBuyers value that it will not burn or give off toxic smoke.
  • InstallationMixedIt friction-fits and cuts easily, but overhead work is heavy and slow.
  • CostCriticisedReviewers say it costs more than standard fiberglass insulation.

Questions and answers

Which is better for exterior walls?
ComfortBatt R23. It is rated R-23 at 5.5 in. for nominal 2×6 wood-framed exterior walls. Safe'n'Sound is made for interior partitions and has no thermal R-value rating.
Which is better for soundproofing a bedroom wall?
Safe'n'Sound. Its NRC of 1.05 is the higher sound absorption of the two, and it is designed for interior partitions. ComfortBatt insulates thermally but is not the acoustic product.
Can I use ComfortBatt in a 2×4 wall?
Not at full thickness. The 5.5 in. batt is made for nominal 2×6 cavities. Compressing it into a 3.5 in. 2×4 cavity cuts its R-value.
Do both resist fire the same way?
Yes on the basics. Both are noncombustible stone wool with 0/0 flame spread and smoke developed ratings and a melt point near 2150°F. Safe'n'Sound adds GREENGUARD Gold certification.
Is Safe'n'Sound worth stepping up to for a whole house?
Only for interior walls and floors where noise is the concern. For exterior walls you still need a thermal batt like ComfortBatt to hit the R-value.

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More comparisons

  • Rockwool Comfortbatt R-30.0 Attic Wall Unfaced Stone Wool Batt Insulation 29.9-Sq Feet 15.25-Inches W x 47.0-Inches L vs ROCKWOOL RXCB551525 COMFORTBATT R23 5.5 In. X 15.25 In. X 47 In (39.82 SQFT)
  • Rockwool Comfortbatt R-30.0 Attic Wall Unfaced Stone Wool Batt Insulation 29.9-Sq Feet 15.25-Inches W x 47.0-Inches L vs ROCKWOOL Safe’n’Sound
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