This is a cache of https://www.owenscorning.com/en-ca/insulation/products/thermafiber-firespan-curtain-wall-insulation. It is a snapshot of the page as it appeared on 2026-10-08T03:41:59.441+0000.
Thermafiber® FireSpan® | Owens Corning Insulation

Thermafiber® FireSpan® mineral wool insulation products are designed to provide enhanced fire protection in curtain wall and perimeter fire containment systems as well as enhanced performance in thermal and acoustical applications. Thermafiber® FireSpan® is available in 4.0 pcf and 8.0 pcf nominal densities for specific application needs. These products are noncombustible, moisture-resistant, noncorrosive, nondeteriorating, mildew-resistant, and
vermin-resistant. Its natural colour provides shadowing in glass spandrels. FireSpan® insulations provide thermal insulation, fire containment, enhanced acoustical performance, and vapour control in many different UL® and Intertek® listed fire containment assemblies of 1-, 2-, and 3-hour ratings.1

1 See individual listings for hourly F ratings.

Features

  • Available in 64 kg/m3 (4.0 pcf) and 128 kg/m3 (8.0 pcf) nominal densities for specific application needs
  • Exceptional performance in Perimeter Fire Containment Systems
  • Provides fire containment in rated assemblies
  • Fire-resistant to temperatures above 1,093°C (2,000°F)2
  • Can be easily fabricated to fit around various types of curtain wall anchors
  • Helps conserve energy, reduce greenhouse gas emissions
  • Mold-resistant
  • Enhances acoustical performance
  • Natural colour provides shadowing in glass spandrels
  • More robust foil-facing provides additional durability on the job site or during transit
  • Minimum 70% recycled content
  • Contributes to credits in several green building programs, such as LEED® and Green Globes®

Standards, Code Compliance

  • CAN/ULC-S702.1, Standard for Mineral Wool Fibre Thermal Insulations, Type 1 (Unfaced), Type 3 (Foil Faced)
  • ASTM C612
    •  FireSpan® 40 Types IA, IB, II, III, IVA
    •  FireSpan® 90 Types IA, IB, II, III, IVA, IVB

Installation

FireSpan® products should be mechanically attached to horizontal and vertical mullions based on mechanical fastener requirements per UL/Intertek tested and listed system. Reinforce FireSpan® insulation on the outer insulation surface at the safing line. Typical reinforcement members include hat channels, “L” angles, and “T” bars. Thermafiber Inc.’s patented Impasse® system is designed to quickly and easily mechanically attach FireSpan® insulation to curtain wall systems.

2 As tested to ASTM E119 Time Temperature Curve within ASTM E2307.

Certifications and Sustainable Features

  • Verified by ICC-ES to contain a minimum of 70% recycled content. See ICC-ES Evaluation Report VAR-1025 at icc-es.org.
  • Environmental Product Declaration (EPD) has been certified by UL Environment. For more information, visit ul.com/epd.
  • FireSpan® products have a published Health Product Declaration (HPD).
Note: UL® certification for FireSpan® 40 & 90 only.

Technical Information

Performance Criteria

PROPERTY

VALUE

TEST METHOD

COMPLIANCE

CCMC Evaluation Listing No. 14060-L
Type 1 (Unfaced), Type 3 (Foil Faced)

CCMC
CAN/ULC-S702.1

Additional Performance Information

PROPERTY

VALUE

TEST METHOD
STABILITYLinear Shrinkage <2% @ 650°C (1200°F)ASTM C356

FIRE

Complies

CAN/ULC-S114

Non-Combustible

ASTM E136

Unfaced, Flame Spread 0, Smoke Developed 0
Faced, Flame Spread 25, Smoke Developed 0

CAN/ULC-S102

Unfaced, Flame Spread 0, Smoke Developed 0
Faced, Flame Spread 25, Smoke Developed 0

ASTM E84

Perimeter Fire Containment Systems:
Safing insulation used in conjunction with Thermafiber® FireSpan® insulations and with an approved fill,
void, or cavity material sealant in the Perimeter Fire Containment System (Complies)

ASTM E2307

Fire Test of Firestop Systems (Complies)

CAN/ULC-S115

MOISTURE

Water Vapour Sorption less than 1% by volume

ASTM C1104

Water Vapour Permeance;
Unfaced FireSpan®, 2850 ng/Pa.s.m2 (50 Perms)
Foil-Faced FireSpan®, 1 ng/Pa.s.m2 (0.02 Perms)

ASTM E96
Fungi Resistance - PassASTM C1338

CORROSION

Steel, Aluminum, Copper - Non-corrosive Types I, III (Class A, Category 1)

ASTM C665

Perimeter Fire Containment Tests per ASTM E2307

FireSpan® insulation is the insulation for perimeter fire containment.Thermafiber, Inc. has performed decades of testing in all of the fire containment systems listed below.

  • Aluminum Spandrel
  • Steel Stud-Framed/Gypsum Sheathing
  • Glass Spandrel
  • Granite Spandrel
  • Precast Concrete
  • Steel Back Pan
  • Zero Spandrel

For more complete test information, see UL® and Intertek® directories. For a full listing of fire containment systems, visit www.thermafiber.com and click on Fire Rated Assemblies.

For additional job-specific details and accessory materials necessary to complete the perimeter fire containment system, please refer to UL® and Intertek® design listings.4,5

See Owens Corning publication “Enclosure Solutions Perimeter Fire Containment System E2307 Curtain Wall Technical Bulletin” for more information.

See Owens Corning publication "Enclosure Solutions Zero Spandrel Perimeter Fire Containment System Technical Bulletin" for more information.

See Owens Corning publication "Thermafiber® Perimeter Fire Containment System Guide" for more information.

4 UL Fire Rated Designs, UL 333 Pfingsten Road, Northbrook, IL 60062.
5 Intertek Laboratories Designs, Fire Resistance Directory, Intertek 16015 Shady Falls Rd. Elmendorf, TX 78112.

Technical Data


NOMINAL DENSITY

RSI /25.4 MM @ 24 ºC M2•K/W

R-VALUE/INCH @ 75 ºF HR•FT2•ºF/BTU

TEST METHOD

FireSpan® 40

64 kg/m3 (4.0 lbs/ft3)

0.74

4.2


ASTM C518

FireSpan® 90

128 kg/m3 (8.0 lbs/ft3)

0.74

4.2

Availability

Code compliant perimeter fire containtment systems require FireSpan® 90 at a minimum of 51 mm (2") or greater and/or FireSpan® 40 at 102 mm (4") or greater and will have a UL® certification. However, each UL® or Intertek® listing requires a specific thickness. Refer to the design listing for correct thickness. Lesser thicknesses, respectively, should be used for thermal or acoustical applications and will not have a certification.


THICKNESS6

STANDARD DIMENSIONS7

FireSpan® 40

51 mm - 178 mm (2" - 7")

610 mm x 1219 mm (24" x 48"),
610 mm x 1524 mm (24" x 60"),
914 mm x 1524 mm (36" x 60"),
1219 mm x 1829 mm (48" x 72")

FireSpan® 90

25 mm - 178 mm (1" - 7")

Tolerances

+6 mm (¼"), -3 mm (⅛")

±3 mm (⅛"), +19 mm (¾"), -6 mm (¼")

6 Thicknesses are available in 13 mm (½") increments.
7 Custom sizes are available upon request.

Product Options

  • FireSpan® 40, 51 mm (2") or greater thickness, is available with a vapour-retarding foil-facing.
  • FireSpan® 90, 25 mm (1")8 or greater thickness, is available with a vapour-retarding foil-facing.
8 Substitution of 51 mm (2") thick FireSpan® 90 mullion covers with 25 mm (1") thick FireSpan® 90 mullion covers will require an engineering judgment from the Thermafiber Insolutins® Team.


Technical Services Available

For Canadian Technical inquiries, please contact our technical team at owenscorning.ca/contacttech.


Environmental and Sustainability

Owens Corning is a worldwide leader in building material systems, insulation, and composite solutions, delivering a broad range of high-quality products and services.

Owens Corning is committed to driving sustainability by delivering solutions, transforming markets, and enhancing lives. More information can be found at owenscorning.ca or owenscorninglibrary.ca.


Disclaimer of Liability
Technical information contained herein is furnished without charge or obligation and is given and accepted at recipient’s sole risk. Because conditions of use may vary and are beyond our control, Owens Corning makes no representation about, and is not responsible or liable for, the accuracy or reliability of data associated with particular uses of any product described herein. Owens Corning reserves the right to modify this document without prior notice.
LEED® is a registered trademark of the U.S. Green Building Council.
Green Globes® is a registered trademark of Green Building Initiative, Inc.

Notes
For additional information, refer to the Safe Use Instruction Sheet (SUIS) found in the SDS Database via sds.owenscorning.com.

Applications

  • Facades > Metal
  • Walls

Contact Us

Even though we're a global company, we're always ready to answer your questions. Call to speak with an Owens Corning representative.