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ROCKWOOL Comfortbatt R30 vs ROCKWOOL Safe'n'Sound

Buy Comfortbatt R30 if you are insulating exterior walls or any cavity that needs a thermal rating; it is the only one of the two with an R-value, and at 7.25 in thick it fills a 2x8 cavity. Buy Safe'n'Sound if the goal is quiet interior walls, ceilings or floors between rooms, where its 3 in batts fit 2x4 framing and its density damps sound. Both are non-combustible mineral wool with flame spread and smoke indexes of 0 and a friction fit, and owners consistently report they cut noise and hold up better than fiberglass. Comfortbatt is the thermal workhorse; Safe'n'Sound is the acoustic and fire-blocking specialist.

  • Choose the Comfortbatt R30 if you are insulating exterior walls, attics or floors and need a rated R-30 in a 7.25 in cavity.
  • Choose the Safe'n'Sound if you are soundproofing interior partitions, ceilings or floors in 2x4 framing and want fire resistance as well.

Prices

  • ROCKWOOL Comfortbatt R30: $76.21 at Tart Lumber (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 $11.21 cheaper than the ROCKWOOL Comfortbatt R30 at the latest prices (Nov 9)
ROCKWOOL
Rockwool Comfortbatt R30 (All Sizes)

ROCKWOOL Comfortbatt R30

Rockwool Comfortbatt R30 (All Sizes)

5(2 ratings)
$76.21at Tart LumberChecked 10 h ago
See all prices and details
Visit Tart Lumber
Pros
  • Rated R-30 for real thermal performance
  • 7.25 in depth suits 2x8 exterior walls
  • Non-combustible with 0 flame spread and 0 smoke index
  • Multiple widths for 16 and 24 in framing
  • Friction fit, cuts cleanly with a serrated blade
Cons
  • Thick batts are bulky to handle overhead
  • No published sound rating; not the acoustic pick
  • Not marketed with GREENGUARD Gold certification
  • Wrong depth for standard 2x4 interior walls
ROCKWOOL
ROCKWOOL Safe’n’Sound

ROCKWOOL Safe'n'Sound

ROCKWOOL Safe’n’Sound

$65.00at Years Building MaterialsChecked 10 h ago
See all prices and details
Visit Years Building Materials
Pros
  • Made for sound dampening in interior partitions
  • 3 in batts fit 2x4 walls without compressing
  • Withstands roughly 1177 C and will not promote flame spread
  • GREENGUARD Gold certified for indoor air
  • Friction fit for walls, ceilings and floors
Cons
  • No R-value, so it is not a thermal insulation substitute
  • Only 3 in and 6 in thicknesses
  • Denser and heavier per square foot than Comfortbatt
  • Overkill for a simple thermal job

What separates them

ROCKWOOL Comfortbatt R30ROCKWOOL Safe'n'Sound
Thermal ratingR-30, a stated insulating valueNo R-value published; sold for acoustics and fire
Thickness and framing7.25 in, fits 2x8 cavities and 16 in on-center studs3 in (also 6 in), fits standard 2x4 interior walls
Sound controlDense mineral wool that helps, but not its stated purposeEngineered for acoustical dampening in partitions
Fire performanceFlame spread 0, smoke developed 0, non-combustibleFlame spread 0, smoke developed 0, withstands about 1177 C
DensityOver 2 pcf2.4 pcf
Indoor air certificationNot listed as GREENGUARD GoldUL GREENGUARD Gold Certified
Best useExterior envelopes, attics, thermal upgradesInterior walls, ceilings, floors between rooms

Price history

$89.12$65.00
Nov 7Nov 10
  • ROCKWOOL Comfortbatt R30: lowest $76.21 on Nov 10 at Tart Lumber.
  • ROCKWOOL Safe'n'Sound: lowest $65.00 on Nov 10 at Years Building Materials.

Prices at every store

ROCKWOOL Comfortbatt R30

  • Stones Ace ofNew

    In stock

    $84.99Checked 10 h ago
    Visit Stones Ace of
  • McCoy's Building SupplyNew

    In stock

    $84.99Checked 10 h ago
    Visit McCoy's Building Supply
  • Tart LumberNew

    Availability unknown

    $76.21Checked 10 h ago
    Visit Tart Lumber
  • Hamshawlumber.comNew

    Availability unknown

    $86.99Checked 10 h ago
    Visit Hamshawlumber.com
All 8 stores and price history →

ROCKWOOL Safe'n'Sound

  • Years Building MaterialsNew

    In stock

    $65.00Checked 10 h ago
    Visit Years Building Materials
  • Home DepotNew

    In stock

    $83.98Free shippingChecked 10 h ago
    Visit Home Depot
  • The Home DepotNew

    In stock

    $83.98Free shippingChecked 10 h ago
    Visit The Home Depot
  • Lowe'sNew

    In stock

    $83.98Free shippingChecked 10 h ago
    Visit Lowe's

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

All 9 stores and price history →

Specs compared

SpecROCKWOOL Comfortbatt R30ROCKWOOL Safe'n'Sound
Thickness7.253 in
Width15.2515-1/4 in
Length4747 in
Density>2 pcf2.4 pcf
Flame Spread Index00
Smoke Developed Index00
MaterialMineral WoolMineral Wool
R-Value30—
Square Feet Per Pack29.9—
Framing Width16" OC—
ConstructionWood Stud—
Application—For Wood Stud Framing
Show all 16 specsShow fewer specs
SpecROCKWOOL Comfortbatt R30ROCKWOOL Safe'n'Sound
Melting Point—approximately 1177 deg C
Heat Resistance—over 1,000°C/1842°F
Available Thicknesses—3" and 6”
Certification—UL GREENGUARD Gold Certified

What reviewers say

ROCKWOOL Comfortbatt R30

Owners of ROCKWOOL Comfortbatt generally report it installs easily, fits snugly in stud bays and noticeably quiets rooms compared with fiberglass. The common complaints are the higher price and the dust and itch while handling it.

What people mention
  • Sound controlPraisedOwners say the dense batts noticeably quiet rooms and floors compared with fiberglass.
  • FitPraisedReviewers report the batts friction-fit 16-inch on-center bays with minimal trimming.
  • PriceCriticisedBuyers say it costs more per square foot than fiberglass insulation of the same R-value.
  • HandlingMixedOwners find it cuts cleanly but is heavy, dusty and itchy without gloves and sleeves.

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 soundproofing a bedroom wall?
Safe'n'Sound. It is designed for acoustical dampening in interior partitions and its 3 in batts fit a 2x4 wall. Comfortbatt helps somewhat but is built for thermal performance.
Can I use Safe'n'Sound in exterior walls?
Not as thermal insulation. It has no published R-value, so it will not meet an energy code for an exterior envelope. Use Comfortbatt R30 there.
Which lasts longer?
Both are stone wool and resist moisture, rot and fire, so neither degrades like fiberglass. In a dry, properly detailed cavity both should last the life of the building.
Is Comfortbatt R30 worth stepping up to over thinner batts?
If your cavity is 7.25 in deep, yes. R-30 in one layer beats stacking thinner batts and avoids compression, which lowers performance.
Do either of these burn?
No. Both are non-combustible mineral wool with a flame spread index of 0 and smoke developed index of 0. Safe'n'Sound adds a stated melting point near 1177 C.
Which is easier to install?
Both friction-fit between studs and cut with a serrated blade. Safe'n'Sound's 3 in batts are lighter and easier overhead; Comfortbatt's 7.25 in batts are heavier to handle.

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