Intumescent Strip, Single or Double fin

[Guest Mark]

Hi,

I have just had an FD30 internal fire door installed between a garage and hallway.  The frame of the door has been rebated a fitted by our joiner with an intumescent strip.  

There is a cold draught coming through the door due to a 3-4mm gap around the whole of the door (between the door and rebated intumescent strip).

I have seen that there are intumescent strips with a single, double or triple fin that look like they could act as a smoke seal and draught excluder.

Please may someone advise whether the installation of these would be recommended to solve my problem?  If so, should I be buying an intumescent strip with a single, double, triple or a side fin? What would be this difference in installing one over the other?

finally, would anyone know how many millimetres the fin protrudes out?

Thank you!

[Guest Mark]

3 hours ago, Guest Mark said:

Hi,

I have just had an FD30 internal fire door installed between a garage and hallway.  The frame of the door has been rebated a fitted by our joiner with an intumescent strip.  

There is a cold draught coming through the door due to a 3-4mm gap around the whole of the door (between the door and rebated intumescent strip).

I have seen that there are intumescent strips with a single, double or triple fin that look like they could act as a smoke seal and draught excluder.

Please may someone advise whether the installation of these would be recommended to solve my problem?  If so, should I be buying an intumescent strip with a single, double, triple or a side fin? What would be this difference in installing one over the other?

finally, would anyone know how many millimetres the fin protrudes out?

Thank you!

Sorry, the 3-4mm gap around the door is more like 2mm

[AnthonyB]

- refer to current Building Regulations - 

[Neil ashdown]

Current Building Regulations require that a door between a dwellinghouse and a garage is a self-closing thirty minute fire door with cold smoke seals. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/937931/ADB_Vol1_Dwellings_2019_edition_inc_2020_amendments.pdf  Appendix C

Various types of smoke seals are available including bat wing, compression, combined intumescent with brush and combined intumescent with a fin or fins. There is guidance about selecting smoke seals for doors here https://www.ifsa.org.uk/documents/

Edited January 24, 2022 by Neil ashdown
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