Everbuild B1 Gun Grade Firefoam is a quick-setting, fire-rated, one-part polyurethane foam. It expands on application to yield up to 50 times the can contents and meets the extremely stringent requirements of the test criteria DIN 4102 Part 1 for Construction Materials; Class B1 and BS 476 Part 20. Fire rated up to 4 hours in certain joint configurations. For use with a Sabre foam gun. Once cured the foam can be cut, sawn or plastered over after only one hour.


Available in:
750ml Aerosol


  • Pipe entries through fire rated walls
  • Fire rated seal around window and door frames
  • Electrical wire chasing
  • Deep joints
  • Irregular gaps
  • Timber structures
  • Windowsills
  • Window frames
  • Behind cladding to exterior walls
  • Behind soffit and barge boards

See all applications in our Technical Data Sheet

See all applications in our Technical Data Sheet

How to use

  • Substrate Preparation

    Ensure substrates are clean, dry and free of dust and grease. Priming is not required.

  • Application

    Shake the new Everbuild B1 Firefoam aerosol can for at least 20 seconds. Screw the nozzle firmly into place without pressing the trigger or the valve. The amount of expanding foam extruded can be regulated by applying more or less pressure on the trigger. Fill deep joints in several layers. Take care to allow each layer to cure and expand sufficiently by spraying water between each layer or allowing sufficient waiting time between the layers.

  • After Use

    Keep a filled can of foam attached to the gun and the gun filled with foam. Failure to do so will result in the foam curing in the gun. Tighten the flow adjustment screw to prevent accidental discharge. Store the can vertically with the gun facing upwards.

  • Cleaning

    Clean all tools and application equipment immediately with Everbuild Dual Purpose Foam Cleaner. Once cured, residual material can only be removed mechanically.



Is Everbuild B1 Firefoam certified to AS1530.4 2014?

Yes, it has been rigorously tested in accordance with AS1530.4 and AS4072.1-2005. Further documentation can be accessed in our downloads section. For specific details please contact Sabre Technical Department for assistance.

How long does Everbuild B1 Firefoam take to cure?

Everbuild B1 Firefoam is quick setting and can be cut, sawn or plastered in 1 hour.

What do I use to clean the foam gun after use?

Clean all tools and equipment with Everbuild Dual Purpose Foam Cleaner.

Is Everbuild B1 Firefoam UV Stable?

No. If the foam is going to be left exposed to sunlight long-term, it is recommended that the foam be painted.

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