Which is better for an attic?

COMFORTBATT R-23. It carries an R-23 rating and is listed for ceilings, floors and walls. SAFE 'n' SOUND is a sound product with no R-value, so it will not meet attic insulation targets.

Which is better for soundproofing a bedroom wall?

SAFE 'n' SOUND. It is designed for sound absorption and fits 2x4 walls at 3 in thick. COMFORTBATT R-23 is a thermal product and its 5-1/2 in depth needs 2x6 framing.

Is SAFE 'n' SOUND worth the lower price?

It is cheaper per pack ($83.98 vs $89.98 at The Home Depot as of November 7, 2026) and covers more area, but only if you need sound control. For thermal insulation it is not a substitute for R-23.

Can I use COMFORTBATT R-23 in a 2x4 wall?

Not without compressing it. It is 5-1/2 in thick for 2x6 framing; compressing it into a 3-1/2 in cavity reduces its effective R-value. Use SAFE 'n' SOUND or a thinner batt for 2x4 walls.

Do both resist fire and moisture?

Yes. Both are non-combustible stone wool rated to 2150°F, water resistant and resistant to mold growth. The difference is thermal rating and thickness, not fire or moisture behavior.

How much do I need for a 10 ft by 10 ft wall?

A 100 sq ft wall needs about 3 packs of COMFORTBATT R-23 (39.8 sq ft each) or 2 packs of SAFE 'n' SOUND (59.7 sq ft each). Add 10 percent for cuts and framing.

Rockwool Comfortbatt R-23 Stone Wool Insulation vs Rockwool Safe 'n' Sound 3-Inch Batt

Buy COMFORTBATT R-23 if you are insulating walls or an attic for thermal performance; it is the only one of the two with a real R-value (R-23 at 5-1/2 in). Buy SAFE 'n' SOUND if your goal is quieting interior walls, ceilings or rooms, since it is a sound-control product with no R-value claim. As of November 7, 2026, SAFE 'n' SOUND is $83.98 at The Home Depot and COMFORTBATT R-23 is $89.98 at The Home Depot, so the sound batt is about $6 cheaper per pack but covers more area per pack.

Today the Rockwool Safe 'n' Sound 3-Inch Batt costs $6.00 less at its best price.

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Rockwool COMFORTBATT R-23 Attic Wall Unfaced Stone Wool Batt Insulation 39.8-sq ft (15.25-in W x 47-in L) RXCB551525

What separates them

	Rockwool Comfortbatt R-23 Stone Wool Insulation	Rockwool Safe 'n' Sound 3-Inch Batt
Primary purpose	Thermal insulation rated R-23	Sound absorption and soundproofing, no R-value stated
Thickness	5-1/2 in, fits 2x6 framing	3 in, fits 2x4 framing
Coverage per pack	39.8 sq ft	59.7 sq ft listed (65 sq ft in spec text)
Price per pack	$89.98 at The Home Depot as of November 7, 2026	$83.98 at The Home Depot as of November 7, 2026
Price per sq ft	About $2.26 per sq ft	About $1.41 per sq ft at 59.7 sq ft
Fire and heat resistance	Withstands up to 2150°F, non-combustible stone wool	Non-combustible, up to 2150°F
Moisture and mold	Stone wool, water resistant, does not promote mold	Water resistant, does not promote mildew, fungi or mold
Installation	Friction-fit batt, cut with a serrated knife	Friction-fit batt, cut with a serrated knife

Specs compared

Spec	Rockwool Comfortbatt R-23 Stone Wool Insulation	Rockwool Safe 'n' Sound 3-Inch Batt
Area of Use	Ceiling, Floor, Wall	Ceiling, Floor
Width	47	15.25
Thickness	5-1/2	3 in
Length	3.91	47.0
R-Value	R23	—
Coverage Area	39.8	—
Material	Stone Wool	—
Temperature Rating	2150	—
Type	Batt	—
Product Type	—	Soundproofing insulation
Material Type	—	Insulation, Soundproofing insulation
Material Composition	—	Stone wool, Mineral Wool

Show all 28 specs

Spec	Rockwool Comfortbatt R-23 Stone Wool Insulation	Rockwool Safe 'n' Sound 3-Inch Batt
Area	—	65 sqft
Form Factor	—	Batt
Intended Use	—	Walls, Ceilings
Surface	—	Wood
Fire Resistance	—	Non-combustible
Mold Resistance	—	Does not promote the growth of mildew, fungi or…
Water Resistance	—	Water resistant
Installation Method	—	Friction fit
Installation Tools	—	Serrated knife (for cutting)

Rockwool Comfortbatt R-23 Stone Wool Insulation vs Rockwool Safe 'n' Sound 3-Inch Batt

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Rockwool Comfortbatt R-23 Stone Wool Insulation vs Rockwool Safe 'n' Sound 3-Inch Batt

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Rockwool Safe 'n' Sound 3-Inch Batt

What separates them

Price history

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