Author Topic: Fire resistance of external fire door  (Read 98 times)

Offline GB

  • Full Member
  • ***
  • Posts: 223
Fire resistance of external fire door
« on: July 11, 2019, 04:28:40 PM »
BS 9991 2015 requires the external wall of a sprinklered building over 18m to be constructed providing 60 minutes fire resistance.

Do all external doors need to provide the same period of fire resistance?

I have looked in Table 12 of BS 9991 and external doors could be deemed to be forming part of the enclosure of a protected lobby to a stair therefore FD30(s)

does anyone have a view on this?

Offline Fishy

  • Hero Member
  • *****
  • Posts: 739
Re: Fire resistance of external fire door
« Reply #1 on: July 15, 2019, 11:31:20 AM »
BS 9991 2015 requires the external wall of a sprinklered building over 18m to be constructed providing 60 minutes fire resistance.

It's not quite that simple; the wall may or may not be fire resisting, and the exact recommendations depend on boundary conditions and whether the external wall is load-bearing.  Have a look in particular at Note G to Table 3 in the standard.

If the wall has to be 100% fire resisting then the external doorsets would need to be so, too.