FAQs

FAS Fire Door Foam™ is a fire-rated expanding foam that has been extensively tested for use in fire door installations and perimeter fire-stopping applications. The product has been fire tested to provide up to 60 minutes of fire resistance in timber and composite doorsets and timber glazed screens in accordance with BS 476: Part 20 & 22: 1987 and BS EN 1634-1. When installed in conjunction with FAS Fire Door Intumescent Acrylic Sealant or FAS Fire Door Silicone, the system has been tested to achieve up to 120 minutes of fire resistance. Please refer to the installation guidance available on the Fire Door Foam™ product page for approved installation methods and tested configurations.

No, FAS Fire Door Foam™ must be applied to both sides of the door frame and must completely fill the void between the frame and the surrounding wall in accordance with the tested installation method. Using Fire Door Foam™ on one side only and acrylic sealant on the other is not an approved installation configuration.

For gaps up to 5mm, FAS Fire Door Intumescent Acrylic Sealant can be used on its own without the need for a backing material. Always follow the relevant installation guidance, certification and fire test evidence to ensure the correct fire stopping solution is used for the specific gap size and fire door application.

FAS Fire Door Foam™ can be installed in perimeter gaps ranging from a minimum practical width of 5mm to a maximum tested gap of 33mm. The fire-rated foam is designed for sealing gaps around fire door frames as part of a tested fire-stopping system. For guidance on permitted gap sizes for specific fire door assemblies and fire resistance requirements, please refer to the FAS Fire Door Foam™ Installation Guide.

No, packers do not need to be covered with FAS Fire Door Foam™, provided they are installed correctly. Plastic or timber packers can remain exposed as long as they are fitted flush with the edge of the door frame or cut back level with the frame edge. This allows the fire door sealing system to be installed in accordance with the tested configuration. Always refer to the relevant installation guidance, certification and fire test evidence to ensure compliance with the specified fire door assembly.

No, FAS Fire Door Foam™ does not require specialist packers or fixings. The product has been specifically tested for use with plastic packers and standard screw fixings as part of a tested fire door installation system. Timber packers and MDF packers may also be used where required. Always ensure the installation is carried out in accordance with the relevant fire test evidence, certification and installation guidance to maintain the fire performance of the door assembly.

Yes, FAS Fire Door Foam™ is NHBC approved for use in fire door installation applications. The product is also specified and mandated by multiple national housebuilders and building developers for the installation of fire doors, reflecting its suitability for use within tested fire door systems. Designed specifically for sealing gaps between fire door frames and surrounding walls, FAS Fire Door Foam™ provides a fast and effective fire-stopping solution for residential and commercial construction projects.

Always refer to the relevant certification, installation guidance and project specifications to ensure compliance with the requirements of the fire door assembly.

No, there is no need to cap with mastic for fire ratings of up to 60 minutes. Our Fire Door Foam™ is also tested for smoke.

Yes, timber packers can be used with FAS Fire Door Foam™. The product has been tested for use with both plastic packers and timber packers as part of a fire door installation system. Where timber packers are used, they should be of an equal or greater density than the door frame to ensure compatibility with the tested installation method. Always follow the relevant installation guidance, certification and fire test evidence when installing fire door frames and fire stopping products.

Architraves are optional, Fire Door Foam™ has been tested with and without.

FAS Fire Door Foam™ is a fire-rated expanding foam designed to simplify fire door installation and fire-stopping applications. Compared to traditional stone mineral fibre wool, it offers a quicker and more cost-effective installation method, helping to reduce labour time and overall project costs. When used with FAS Fire Door Intumescent Acrylic Sealant, it forms part of a tested fire door sealing system for perimeter gap sealing around fire door frames.