FAQs

FAS Fire Door Intumescent Acrylic Sealant has been fire tested to provide 30, 60, 90 and up to 120 minutes of fire resistance in timber fire doors and timber glazed screens. The sealant has been tested in accordance with BS 476: Part 20 & 22: 1987 and BS EN 1634-1, demonstrating its suitability for use as part of a tested fire door sealing and fire stopping system. The achievable fire rating will depend on the application, gap size and installation configuration. Always refer to the relevant certification, fire test evidence and installation guidance for the specific fire door assembly.

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

FAS Fire Door Intumescent Acrylic Sealant can be used to seal gaps up to 5mm wide without a backing material. For larger gaps, the sealant has been tested for use in gaps up to 25mm wide when installed in conjunction with FAS Fire Door Foam™ or stone mineral fibre wool as part of a tested fire door sealing system. Always refer to the relevant fire test evidence, certification and installation guidance to ensure the correct sealing method is used for your specific fire door application.

Yes, architraves can be installed over FAS Fire Door Silicone Sealant if required. However, architraves are not essential for the fire performance of the sealant, as FAS Fire Door Silicone Sealant has been successfully tested without architraves as part of the tested fire door sealing system. Always follow the relevant installation guidance and fire test evidence to ensure compliance with the specified fire door assembly.

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

A 310ml cartridge of FAS Fire Door Silicone Sealant will provide approximately 8.5 linear metres of sealant when applied as a 6mm x 6mm bead. For larger joints, a single cartridge will seal approximately 2.5 linear metres with a joint size of 15mm x 8mm. Actual coverage may vary depending on the joint dimensions, substrate condition and application method. For detailed installation guidance and sealant usage calculations, please refer to the product datasheet.

Yes, architraves can be installed over FAS Fire Door Intumescent Acrylic Sealant where required. However, architraves are optional, as the sealant has been successfully fire tested both with and without architraves as part of a tested fire door sealing system. This provides flexibility when sealing perimeter gaps around fire door frames whilst maintaining the tested fire performance of the installation. Always follow the relevant installation guidance, certification and fire test evidence for the specific fire door assembly.

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].

Yes, FAS Fire Door Intumescent Acrylic Sealant has a shelf life of up to 18 months when stored unopened in temperate conditions between 5°C and 30°C. To help maintain product performance and longevity, the sealant should be stored in a cool, dry environment and protected from extreme temperatures. Always check the product packaging and technical documentation for storage recommendations before use.

Fire mastic, also known as fire-rated mastic or intumescent sealant, is used to seal gaps, joints and linear seals in walls and other building elements to help prevent the passage of fire, smoke and hot gases. Fire-stopping mastics are commonly used around construction joints, service penetrations and perimeter gaps where fire resistance needs to be maintained. To ensure compliance and performance, always check the relevant certification, technical documentation, and fire test evidence, and use a tested fire-stopping solution that is suitable for the specific application and construction type.