FAQs

Selecting the correct fire-rated sealants for a fire door installation is essential to maintaining the fire performance of the door assembly and helping to prevent the spread of fire and smoke.

When sealing gaps between the fire door frame and the surrounding wall, it is important to use products that have been tested in fire door assemblies and comply with the recommendations of BS 8214:2016.

When choosing a fire-rated sealant, check that:

• Fire-rated mastics have been successfully tested as a linear gap seal in accordance with BS 476-20 or BS EN 1366-4 for the required fire resistance period.
• Fire-rated expanding foams have been successfully tested as a linear gap seal in accordance with BS 476-20 or BS EN 1366-4 and provide a minimum of 30 minutes fire resistance.
• The sealant has been included within a fire test between the door frame and surrounding structure on a timber-based fire door assembly tested in accordance with BS 476-22 or BS EN 1634-1.

If a product does not provide this information, you should request the relevant fire test evidence and certification before specifying or installing it.

FAS Fire Door Foam™ and FAS Fire-Rated Acrylic Sealant have been independently tested for use in fire door assemblies and are Certifire approved under certificates CF5839 and CF5840. When used individually, both products can provide up to 60 minutes of fire protection. When used together as a tested system, they can achieve up to 120 minutes of fire resistance.

Typical applications include:

• FAS Fire Door Foam™ for gaps up to 25mm to achieve up to 60 minutes of fire protection.
• FAS Fire-Rated Acrylic Sealant for gaps below 5mm to achieve up to 60 minutes of fire protection.
• A minimum 10mm cap of FAS Fire-Rated Acrylic Sealant over FAS Fire Door Foam™ to achieve up to 90–120 minutes of fire protection.
• Installation with standard packers as part of the tested system.

FAS Fire Door Foam™ also replaces the need for mineral fibre wool, helping to reduce installation time by approximately 12 minutes per doorset installation.

For further technical advice on selecting the correct fire door sealants, please contact our team on 0121 521 2179 or [email protected].

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.

Yes, FAS Fire Door Foam™ has been fire tested for use with and without architraves as part of a tested fire door installation system. This provides flexibility when installing and finishing fire door frames, allowing the product to be used in a variety of fire door applications whilst maintaining the tested fire performance of the assembly. Always ensure installation is carried out in accordance with the relevant certification, fire test evidence and installation guidance.

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.