FD30 Fire Door Packing

[frank999]

This is for FD30's.

I understand plastic packers can be used (chisled back where necessary) - behind a 10mm bead of BS476-22 intuminscent mastic (ie mastic made for sealing the gap around door frames and the supporting construction, such as Dow Firestop 400 (Joint Type B, 10mm depth, 10mm width - gives a 2 hour rating).

Gaps will be covered with Ovolo architrave, although it is questionable whether the requred 15mm depth will be attained due to the curved shape of the architrave.

Can anyone point me to the official texts for the specification of packer type (ie is it in the BS8214 Code of Practice).

Thanks

 

[Deleted member 174758]

The relevant legislative instrument is the Regilatory Reform (Fire Safety) Order, 2005 or RRFSO, although on large projects this can often be combined with an insurance laboratory burn test to prove the efficacy of any proposed methodology for fire door/casing installation. This testing as a system can result in the approval of substances such as a specific fire foam for use where the gapping between wall opening and casing are below 10mm (about the.minimum thickness you can actually stuff mineral wool into across the almost full depth of a casing).

AFAIK there isn't a standard for the material used in spacing packers between the wall opening and the outside of the door casing, so in the absence of intumescent or fireproof packers on the market the ubiquitous plastic packers set 10mm in from the surface of the (plasterboard) wall are what gets used, however the remaining gaps between the door casing and the wall must be packed with a suitable fireproof materiaI such as mineral wool to within 10mm of the (plasterboard) surface and the last 10mm filled with intumescent caulk. The use of mineral wool as a gap filling packing material
Is nothing new in fire door frames having been around since at least the 1980s. Is that what you meant?

Are you also considering the gapping between door and casing (2 to 4mm aound 3 sides and maximum of 4mm at the bottom) and the use of intumescent isolation of locks, door closers, etc (by the use of Intergraf papers and the like) in your planning?