Titebond WeatherMaster X-TREME Fireblock low pressure one-component polyurethane foam sealant is a moisture cured foam designed to seal, fill, bond and stop air infiltration in areas where a fireblock product is required. It has a recognizable orange color allowing inspectors to easily identify the use of an approved fireblock product for Type V residential construction. Due to its expansion characteristics, it is more effective than many traditional fireblocking materials for the blocking of flames and smoke in concealed penetrations, preventing flame spread from room to room and floor to floor.

Features & Benefits

  • Class A - Fire Retardant
  • X-TREME temperatures 0°F to 100°F
  • GreenGuard Gold certified
  • 3X the expansion
  • Quick setting – 5 minutes
  • High yield formula
  • Blocks smoke and flames
  • Type V Residential Fireblock with identifiable orange color


  • ASTM 1623
  • ASTM C518
  • ASTM D1621, ASTM D1622 AND ASTM D2126
  • ASTM E814 AND ASTM E2178

Application Guidelines

  • Application Temperature: 40°F to 100°F (5°C to 38°C)
  • 24 oz. - Dispensing Unit Only Application Method: Shake well, attach the container to X-TREME Dispensing Unit and begin dispensing. The Dispensing Unit can be metered by pulling the trigger for the desired rate, or with the metering screw located in the back. Foam application can be interrupted when needed as outlined in the instructions and the Dispensing Unit will be ready for immediate re-use, as long as it remains attached to a pressurized container. An empty gun foam container must be replaced with a new container.
  • 12 oz. - Straw Foam Application Method: Shake well, attach the straw, invert the container and begin dispensing. By activating the adapter lever carefully, the extrusion rate can be regulated.
  • Working Time: Surfaces must be clean, dry, free of loose particles, and free of dust, grease, and mold release agents. It is the sole responsibility of the user to thoroughly test any proposed use with all substrates to determine project suitability prior to using product on your application.
  • Method for Containment: Uncured product is very sticky; carefully remove the bulk of the foam by scraping it up and then immediately remove the residue with a rag and solvent such as X-TREME Cleaner, mineral spirits, acetone (nail polish remover), paint thinner, etc. Once the product is cured it can only be removed mechanically by scraping, buffing, etc. Use appropriate PPE.
  • Method for Cleanup: Scoop up material and place in a disposal container. Dispose of as plastic waste in accordance with all applicable guidelines and regulations. Vapors can accumulate in low areas. Provide ventilation.
  • Coverage: 24 ounce Gun Foam Canister = 1.5 cubic feet per canister
    12 ounce Straw Foam Canister = 0.68 cubic feet per canister

Physical Properties

  • Type: Low pressure, one-component, polyurethane foam
  • Reactive VOC: 165 g/L
  • Freeze / Thaw Stability: Stable
  • Flashpoint: -156°F (-68.9°C) (based on the LPG (Hydrocarbon HC)
  • Density - Straw Foam: 1.10 lbs/ft³ (17.6 kg/m³)
  • K-factor: 0.222 BTU·inch/ft²·h·°F
  • Density - Gun Foam: 1.00 lbs/ft³ (16 kg/m³)
  • R-value: 4.50 per inch
  • Compressive Strength: 6.38 psi (43.9 kPa)
  • Air Barrier Properties: @1.57 psf (75 Pa)
  • Tensile Strength: 12 psi (83 kPa)
  • Dimensional Stability: ± 5%
  • Closed-cell Content: 77%
  • Storage Life: 18 months


  • This product is extremely flammable when dispensing.
  • Carefully review cautions.
  • Optimum temperature for use is between 65° - 80°F (18° - 27°C).
  • Clean oil, dust and grease off surfaces to be foamed.
  • Make sure to cover surrounding surfaces.
  • Wear appropriate safety glasses, gloves and protective clothing. Consult SDS for product safety information.
  • Use in Type V residential construction in vertical and horizontal penetrations between floors and rooms.
  • It is NOT intended for use in hourly rated assemblies.
  • Consult local building codes before use.
For questions, please call our Help Line at 1.800.347.4583 or visit us at Titebond.com.

Product SKUs

Part NumberUPCCase UPCSizeWeightUnits Per PackagePackages Per PalletColor
85410370830854191003708308541612 oz. Can14.001275
85420370830854261003708308542324 oz. Can24.001248

Caution Statement

DANGER: Extremely flammable aerosol. Contains gas under pressure and may explode if heated. Causes skin irritation. May cause an allergic skin reaction. Causes serious eye irritation. Harmful if inhaled. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause harm to breast-fed children. May cause respiratory irritation. May cause damage to organs through prolonged or repeat exposure. Do not handle until all safety precautions have been read and understood. Keep away from heat, sparks, open flames and hot surfaces. No smoking. Do not spray on an open flame or other ignition source. Pressurized container: Do not pierce or burn, even after use. Avoid breathing vapors or fumes. Do not get in eyes, on skin, or on clothing. Wash hands and other skin areas exposed to material thoroughly after handling. Use only outdoors or in a well-ventilated area. Wear protective gloves, protective clothing, and eye protection. In case of inadequate ventilation, wear respiratory protection. FIRST AID: IF ON SKIN: Wash with plenty of soap and water. If skin irritation or rash occurs, get medical attention. IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing. If experiencing respiratory symptoms call a POISON CENTER or doctor. IF IN EYES: Rinse cautiously with water for several minutes. Remove any contact lenses and continue rinsing. If irritation persists: Get medical advice or attention. FIRE: In case of fire: Use water fog, foam, dry chemical, or carbon dioxide for extinction. Eliminate all ignition sources if safe to do so. Store in a well-ventilated place. Protect from sunlight. Do not expose to temperatures exceeding 50°C/ 122°F. Dispose of contents and container in accordance with applicable local, regional, national, or international regulations. For additional information, refer to Safety Data Sheet.

Warranty Statement

LIMITED WARRANTY: Buyer assumes all risks of use, handling and storage of product not in strict accordance with label directions. Liability for any incidental or consequential damage or loss is specifically excluded at all times. Any implied warranty of merchantability or fitness for particular use is excluded. Seller will not accept liability for more than product replacement.

Important Notice: Our recommendations, if any, for the use of this product are based on tests believed to be reliable. Since the use of this product is beyond the control of the manufacturer, no guarantee or warranty, expressed or implied, is made as to such use or effects incidental to such use, handling or possession or the results to be obtained, whether in accordance with the directions or claimed so to be. The manufacturer expressly disclaims responsibility therefore. Furthermore, nothing contained herein shall be construed as a recommendation to use any product in conflict with existing laws and/or patents covering any material or use.

2020 Bruck Street, Columbus, Ohio 43207
CUSTOMER SERVICE 1-800-669-4583
TECH SERVICE 1-800-347-4583

Franklin International