Cavityrock

Exterior Insulation for Cavity Wall

and Rainscreen Applications

Cavityrock® Black: now available with black

mineral fiber facing for open-joint cladding
systems. The facing provides long-term UV
stability as outlined on the next page.

Rush University Medical Center, Chicago, IL

Fire Performance
ROCKWOOL Cavityrock® semi-rigid stone wool insulation board
available in mono and dual density is designed for exterior The non-combustible characteristics of
cavity wall and rainscreen applications. Choose mono-density Cavityrock® insulation mean that it will not
insulation in thicknesses up to 2” or dual-density in thicknesses of develop toxic smoke or promote flame
2.5” to 6”. spread even when directly exposed to fire.

Compatible with numerous cladding attachment systems,

Cavityrock® is a durable solution with non-combustible
characteristics meaning that the insulation will not develop toxic
smoke or promote flame spread even when directly exposed to
fire. Approved for use in many NFPA 285-compliant designs, it
is an important component of fire-resilient exterior wall systems
when used as a continuous insulation.

Cavityrock® also offers energy efficiency with reliable thermal

performance, improved acoustic comfort, and is moisture
resistant to maintain insulating value for the long-term.

Also available in a black mat facer finish for open-joint cladding

systems, Cavityrock® Black combines your insulation install with
masking in a single step, reducing installation time and material
cost to achieve your desired design aesthetic.

Learn more at rockwool.com/products/cavityrock/

Cavityrock
®
Technical Data Sheet
Board Insulation 07210* • Board Insulation 07 21 13**
Exterior Insulation for Cavity Wall Cavity Wall Unit Masonry 04 27 23**
and Rainscreen Applications

ROCKWOOL Cavityrock® is a semi-rigid stone wool insulation board designed for exterior cavity wall and rainscreen
applications. Compatible with numerous cladding attachment systems, Cavityrock® is non-combustible and available with a
black mineral fleece facing for open-joint cladding systems.

Performance Test Standard

Mineral Fiber Block and Board Thermal Insulation - Type IVB Compliant
ASTM C612
Compliance MEA Approval, New York City Approval
236 - 05 - M
For information on CAN/ULC S702 compliance, contact ROCKWOOL Technical Support

Flame spread index = 0; Smoke developed index = 0 ASTM E84 (UL 723)
Flame spread index = 0; Smoke developed index = 0 CAN/ULC S102
Reaction to Fire
Determination of Non Combustibility of Building Materials - Non Combustible CAN/ULC S114
Behaviour of materials at 750°C - Non Combustible ASTM E136

Reaction to fire Flame spread index = 10; Smoke developed index = 25 ASTM E84 (UL 723)
(with black mat facer) Flame spread index = 10; Smoke developed index = 10 CAN/ULC S102

Monolithic Density > 4.3 lbs/ft3 (>69 kg/m3)*

ASTM C303
(thickness: 1”, 1.5”, 2”) * Density will change with thickness, please contact ROCKWOOL for more information

Density (thickness ≥ 2.5”) Dual Density - 6.2 lbs/ft³ (100 kg/m³) outer layer and 3.8 lbs/ft³ (61 kg/m³) inner layer ASTM C303

Dimensional Stability Linear Shrinkage = 0.7% @ 1200°F (650°C) ASTM C356

Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed ASTM C795
Corrosion Resistance
Corrosion of Steel - Passed ASTM C665
o
R-Value / inch @ 75 F 4.3 hr.ft2.F/Btu
Thermal Resistance o
RSI value / 25.4 mm @ 24 C 0.75 m2K/W ASTM C518 (C177)

Moisture Sorption - 0.03% by volume ASTM C1104

Reaction to Moisture Water Vapor Transmission, Desiccant Method - 1555ng/Pa.s.m2 (27 perm) ASTM E96
Determination of Fungi Resistance - Passed ASTM C1338

Moisture Sorption - 0.65% by volume ASTM C1104

Reaction to moisture
Water Vapor Transmission, Desiccant Method - 2435ng/Pa.s.m2 (43 perm) ASTM E96
(with black mat facer)
Determination of Fungi Resistance - Passed ASTM C1338

1” (25.4 mm) to 4” (101.6 mm) in 1/2” increments. 5” (127 mm) , 5.5” (139.7 mm), 6” (152.4 mm),
Dimensions 7” (177.8 mm), 8” (203.2 mm)

24” x 48” (610 mm x 1219 mm) and 16” x 48” (406 mm x 1219 mm)

Dimensions 2” (50.8 mm), 3” (76.2 mm), 4” (101.6 mm) available in 16” x 48” (406 mm x 1219 mm) and
(with black mat facer) 24” x 48” (610 mm x 1219 mm) 2.5” (63.5 mm), 3.5” (88.9 mm), 5” (127 mm),
6” (152.4mm) available in 24” x 48” (610 mm x 1219 mm)

Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC ASTM C423

Acoustical Performance 1.5” 0.19 0.55 1.03 1.06 1.02 1.01 0.9
2” 0.26 0.71 1.14 1.09 1.04 1.03 1
3” 0.72 0.93 0.88 0.84 0.9 0.97 0.9

Determination of changes in color fastness: achieved rating of 5/5 at 250 hr. and 500 hr. exposure, no
UV Stability perceptible change in color, and a rating of 4/5 at 750 hr. and 1,000 hr. exposure.
ISO 105-AO2: 1993
(with black mat facer) For more information and technical reports on ISO 105-A02 results, please contact
ROCKWOOL Technical Services.
Unfaced: “tested on 4.0” sample”
With Black Mat Facer: “tested on 3.5” sample”

Issued: 03-01-2021 SM

NOTE: *Master Format 1995 Edition **Master Format 2004 Edition. As ROCKWOOL has
Supersedes 08-23-17
Stone Wool, Unfaced: Cavityrock®,

no control over installation design and workmanship, accessory materials or application

Comfortboard®, Curtainrock®,
Frontrock™, ROXUL Safe™
ROCKWOOL™
Final Assembly: Byhalia, Mississippi, United States; Grand Forks,
British Columbia, Canada; Milton, Ontario, Canada

conditions, ROCKWOOL does not warranty the performance or results of any

Life Expectancy: Life of Structure Year(s)
End of Life Options: Salvageable/Reusable in its Entirety,

Please contact ROCKWOOL for

Landfill (100%)

Ingredients:

Stone wool, biosoluble; Phenol, polymer with formaldehyde 1;

installation containing ROCKWOOL’s products. ROCKWOOL’s overall liability and the

Syrups, hydrolyzed starch; Urea; Undisclosed ( < 1%) 2

1LBC Temp Exception RL-009 - Formaldehyde Declare labels for other ROCKWOOL
remedies available are limited by the general terms and conditions of sale. This warranty
2
LBC Temp Exception RL-004b - Proprietary Ingredients in

manufacturing facilities.
Declare

Living Building Challenge Criteria: Compliant

1-13 Red List:

□

is in lieu of all other warranties and conditions expressed or implied, including the
LBC Red List Free % Disclosed: 99% at lOOppm
LBC Red List Approved voe Content: Not Applicable
□ Declared

1-10 Interior Performance: Not Applicable

1-14 Responsible Sourcing: Not Applicable

RXL-0002
EXP. 01 FEB 2022
Original Issue Date: 2017

MANUFACTURER RESPONSIBLE FOR LABEL ACCURACY

warranties of merchantability and fitness for a particular purpose.
INTERNATIONAL LIVING FUTURE INSTITUTE™ living-future.org/declare

8024 Esquesing Line, Milton, ON L9T 6W3

Tel: 800-265-6878 • Fax: 800-991-0110
rockwool.com