Mrs

[Guest Steph]

Hey there, have a large gap over 4mm between door frame and beginning of where drop down fire door seal starts. Can I use fire mastic to seal it? Or should I look at other options?

Thanks, Steph

[Neil Ashdown MAFDI]

Please post a photograph of the door and defect.

[Guest Steph]

Hello Neil, Thanks for the reply, as requested please see image attached, the door looks in bad shape as repair work have been carried out  to fix gaps,(still not fixed) and I have been recommended the gap between the drop down seal/fire excluder and door frame/jamb can be sealed by adding fireproof mastic at the bottom, due to its position I am querying if ok to do?  Thanks, Steph

[Neil Ashdown MAFDI]

To comply with the current standard BS 8214: 2016 it would be necessary to reduce the door to frame gap to 4mm maximum and ensure that the threshold seal, when engaged, closes the threshold gap along its length. Mastic would be unsuitable for remediating this defect.

[Guest Steph]

Hello Neil, Thank you for the feedback. Steph

[Neil Ashdown MAFDI]

Looking again at the photo, do you mean the hole or perhaps the gap under the door frame jamb?  If so, these may be filled with suitable timber.

[Guest Steph]

Hi Neil, 

Thanks for looking over this, my concern is the very bottom between the start of the fire excluder and side of the door.  I am concerned adding fire mastic sealant in that area ( I have highlighted with a circle) is not appropriate for fire safety?                                                                                                                                                                                                                                                                                                                                                                                                                                      I have also highlighted an area with a rectangle shape, and querying if fire mastic should be added there, in regards to fire safety?                                                        If any more info needed, please let me know.

Thank you

Steph

[Neil Ashdown MAFDI]

First image: The smoke seal to the door bottom edge should extend as far as the full width of the door leaf. Ideally the vertical smoke seal would be fitted to the door frame (rather than the door leaf) and therefore would seal the gap you have highlighted. Mastic is unsuitable.

Second image: That gap should be 4mm max in accordance with BS 8214: 2016 and the smoke seal fitted to the vertical edge of the door leaf or door frame should seal that gap when the door is closed. Mastic is unsuitable