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Rockwool Comfortboard 80 R-6 Board vs ROCKWOOL Safe'n'Sound

These are two different jobs, not two versions of one product. Comfortboard 80 is a rigid exterior sheathing board that adds continuous R-6.3 outside the studs to cut thermal bridging and let walls dry outward. Safe'n'Sound is a flexible interior batt for wood-stud partitions, aimed at sound control and fire resistance. Buyers and installers rate both highly for fire performance and easy friction fit; Comfortboard is stiffer and denser to handle, while Safe'n'Sound is soft and compresses into cavities.

  • Choose the Comfortboard 80 if you are insulating the outside of basement or exterior walls and want continuous R-value over the studs.
  • Choose the Safe'n'Sound if you are soundproofing interior walls, ceilings or floors in wood or steel stud framing.

Prices

  • Rockwool Comfortboard 80 R-6 Board: $70.88 at Lowe's (last seen Nov 9)
  • ROCKWOOL Safe'n'Sound: $65.00 at Years Building Materials (last seen Nov 9)
  • Difference: the ROCKWOOL Safe'n'Sound is $5.88 cheaper than the Rockwool Comfortboard 80 R-6 Board at the latest prices (Nov 9)
Rockwool
Rockwool Comfortboard 80 R 6 Wall Unfaced Mineral Wool Batt Insulation 48-Sq Feet RXCB11224

Rockwool Comfortboard 80 R-6 Board

Rockwool Comfortboard 80 R 6 Wall Unfaced Mineral Wool Batt Insulation 48-Sq Feet RXCB11224

$70.88at Lowe'sChecked Nov 9
See all prices and details
Visit Lowe's

Store links may earn us a commission. Price via Klarna.

Pros
  • Cuts thermal bridging with a continuous layer outside the studs
  • Rigid boards stay put and hold a straight plane
  • Vapor permeable, so walls dry outward
  • Non-combustible A1 fire rating
Cons
  • Not made for soundproofing interior rooms
  • Stiffer and heavier to cut and handle
  • Only 1-1/2 in. thick per board, so stacking adds up
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
  • Strong sound dampening for shared walls and floors
  • Flame spread and smoke developed both rated 0
  • Friction fit installs fast in wood or steel studs
  • GREENGUARD Gold certified for indoor air
Cons
  • Adds little thermal R-value
  • Soft batts can sag if poorly fitted
  • Not for exterior sheathing duty

What separates them

Rockwool Comfortboard 80 R-6 BoardROCKWOOL Safe'n'Sound
Where it installsExterior continuous sheathing over wall framingInterior cavities in partitions, ceilings and floors
FormRigid 1-1/2 in. boards, 24 x 48 in.Flexible batts, 3 in. thick, 15-1/4 x 47 in.
Thermal roleAdds R-6.3 continuous R-value and blocks thermal bridgingNot sold on R-value; used for acoustics and fire
AcousticsSome sound dampening, not its purposeEngineered for sound dampening in walls and floors
Moisture behaviorVapor permeable, allows outward dryingMineral wool batts, vapor open in cavities
Fire performanceA1 fire classification, non-combustibleFlame spread 0, smoke developed 0, melts near 1177 C
HandlingStiffer and denser, cuts with a sawFriction fit, compresses by hand
Indoor air certificationNot listed as GREENGUARD certifiedUL GREENGUARD Gold Certified

Price history

$83.98$65.00
Nov 7Nov 10
  • Rockwool Comfortboard 80 R-6 Board: lowest $70.88 on Nov 7 at Lowe's; $70.88 on Nov 10.
  • ROCKWOOL Safe'n'Sound: lowest $65.00 on Nov 10 at Years Building Materials.

Prices at every store

Rockwool Comfortboard 80 R-6 Board

  • Lowe'sNew

    In stock

    $70.88Free shippingChecked Nov 9
    Visit Lowe's
  • Home DepotNew

    In stock

    $89.85Checked Nov 9
    Visit Home Depot

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

All 2 stores and price history →

ROCKWOOL Safe'n'Sound

  • Years Building MaterialsNew

    In stock

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

    In stock

    $83.98Free shippingChecked Nov 9
    Visit Home Depot
  • The Home DepotNew

    In stock

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

    In stock

    $83.98Free shippingChecked Nov 9
    Visit Lowe's

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

All 9 stores and price history →

Specs compared

SpecRockwool Comfortboard 80 R-6 BoardROCKWOOL Safe'n'Sound
Fire ClassificationA1—
Thickness—3 in
Width—15-1/4 in
Length—47 in
Density—2.4 pcf
Material—Mineral Wool
Flame Spread Index—0
Smoke Developed Index—0
Application—For Wood Stud Framing
Melting Point—approximately 1177 deg C
Heat Resistance—over 1,000°C/1842°F
Available Thicknesses—3" and 6”
Show all 13 specsShow fewer specs
SpecRockwool Comfortboard 80 R-6 BoardROCKWOOL Safe'n'Sound
Certification—UL GREENGUARD Gold Certified

What reviewers say

Rockwool Comfortboard 80 R-6 Board

Owners and builders praise Comfortboard for fire safety, moisture tolerance and sound deadening, and many use it for exterior walls and basement remodels. Complaints center on weight, dust when cutting and the higher cost than foam board.

What people mention
  • Fire safetyPraisedBuyers value that the boards are noncombustible and add a fire barrier to wall assemblies.
  • MoisturePraisedOwners report it sheds water and lets walls dry, unlike foam board.
  • WeightCriticisedInstallers say the boards are heavy and tiring to lift and place on tall walls.
  • Cutting dustCriticisedCutting generates fibers and dust, so users wear protective gear.

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 one is better for soundproofing a bedroom wall?
Safe'n'Sound. It is made for acoustics in interior partitions and fits between studs. Comfortboard is an exterior board and does little for room-to-room noise.
Can I use Safe'n'Sound on the outside of my house?
No. It is an interior batt for stud cavities. For exterior continuous insulation, use Comfortboard 80, which is rigid and rated for sheathing.
Which lasts longer?
Both are stone wool and resist moisture, rot and fire for the life of the building. Comfortboard's rigid boards hold shape outdoors; Safe'n'Sound stays put when fitted snugly in a closed cavity.
Is Comfortboard worth stepping up to over batt insulation?
If thermal bridging through studs is your problem, yes. A continuous layer outside the framing does what cavity batts cannot. For interior sound, it is the wrong product.
Do either of them burn?
Neither supports flame. Comfortboard carries an A1 fire classification, and Safe'n'Sound rates 0 for flame spread and smoke developed and withstands temperatures near 1177 C.
Which is easier to install myself?
Safe'n'Sound. It friction-fits and compresses by hand. Comfortboard is denser and needs cutting and fastening as exterior sheathing.

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More comparisons

  • Rockwool Comfortbatt R30 (All Sizes) vs ROCKWOOL Safe’n’Sound
  • Rockwool Comfortbatt R30 (All Sizes) vs Rockwool Comfortboard 80 R 6 Wall Unfaced Mineral Wool Batt Insulation 48-Sq Feet RXCB11224

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