Hi all, I have a job fitting fire doors to a fairly old property. The problem is, all the existing frames have a height of max 1950mm and they can't be replaced with new.The manufacturer states that the doors can only be trimmed by 8mm. The doors all fit in width and I'm going to router an intumescent strip into either the existing frame or new door. Has anybody else ever came across this before and what can be done about the bottom? Thanks!
Fire door trimming
- Thread starter Chippyt
- Start date
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That is an option if it comes to it, and I've already used two with fire frames to make an angled double door set on the landing. The rest of the doors however are 4 panel moulded, I've cut one down and it's just filled with chipboard. The customers happy to have them cut down but I'm dubious as its losing its guarantee, The inspector just told the customer to go to the manufacturers recommendations.
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D
Deleted member 174758
This problem comes up on listed buildings quite a lot. On Grade 2 buildings we've repaired the doors (including packing lock mortises with timber, filling hinge recesses with well-fitted Dutchmen, etc), rehung the doors on stainless steel fire hinges and routed the intumescent grooves in the doors rather than the casings - far easier and neater IMHO. The doors can then sent away for blasting and coating with intumescent paint. This gives us a bit of leeway as the paint is pretty thick. If the bottoms have big gaps when rehung we may need to trim the bottom and either add a piece on or install a timber threshold in the door opening, depending on client instructions. Not sure what else you can do with the bottoms as even fire doors are generally allowed a gap at the bottom
If you need to have odd sizes of flush doors you should (technically) order fire door blanks to suit your sizes to stay within the regs. Often, however, standard fire door blanks are modified by trimming to size and relipping one edge and/or the top with 10mm hardwood strip before trimming-in, routing the intumescent grooves and hanging. Agaun, it depemnds on the client's insructions and how deep their pockets are
If you need to have odd sizes of flush doors you should (technically) order fire door blanks to suit your sizes to stay within the regs. Often, however, standard fire door blanks are modified by trimming to size and relipping one edge and/or the top with 10mm hardwood strip before trimming-in, routing the intumescent grooves and hanging. Agaun, it depemnds on the client's insructions and how deep their pockets are
I've used fire check blanks, pu glued hardwood lippings to all cut edges and routered an intumescent into the meeting edges... Inspector was okay with that idea when I rang him, I didn't realise the height issue until today. I thought maybe I could glue a hardwood edging to the bottom of the trimmed moulded doors, I could even put a drop down seal in the bottom but I've only ever done that on commercial offices etc. Customer isn't keen on blanks and doesn't seem bothered about the moulded ones being cut down, for my peace of mind I'd like to do something about the bottoms and of course get them passed by the inspector.
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Deleted member 174758
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