Yes. And this is where practical expediency and reality overtake theory. Doors are fire tested in BS standard frames to obtain the rating. If you are retro-fitting a fire door into an existing casing/frame which has not got intumescent grooves already in it, then the door and casing/frame simply cannot meet the fire regulations because the casing/frame won't be to BS. spec. either. In reality it is normally accepted that without ripping out the door casings/frames and replacing them the nearest you'll get to a fire-rated door opening in practice is by adopting the procedure I've detailed above, i.e. grooving the door. One university, four large hotels and gawd knows how many schools, shops, pubs and restaurants over the last 15 years and the same technique has been accepted by the main contractor and the client insurers as the only practicable approach for the majority of door openings each and every time. If on the other hand you have a specific fire requirement where the door integrity is cruitical, then you'll need to replace the casing/frame as well, in which case the casing/frame will have the appropriate groove or groovesFair enough. The only issue there I think is that the certification details are on the top and the instructions say not to trim the top...
Rebating????? The groove runs down the middle of the door edge. It is not a rebateSeems rebating the top edge won't work?
Attempting to retro-fit an intumescent strip into an already-installed door frame or casing is a complete waste of time and effort IMHO, and I doubt you'd ever see a tradesman attempt it
Count yourself lucky - with heavy Victorian mouldings, especially if overpainted numerous times, there is no way to run a router on the casing. In addition the time penalty of chopping into the casing when you are tasked with 500 or more casings is considerable. just saying.....I must have been unlucky in my career or have been unlucky with clients or architects because I've retro fitted into frames and linings on many many occasions
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