Fire doors were tested early seventies to bs 476 part 8 and the frame door stops was 1 inch 25mm with no intumescent seal.
Fire rated door stop size.
20 gage door constructions are approved for smaller door sizes than what is shown above.
Door stops which assist the door in latching can be cut out of the solid frame a rebate is produced to form a stop for the door or planted.
The planted section should be fixed by pinning or gluing and pinning the stop to the frame.
In addition heavy fire doors may drop by a millimetre or 2 over time and so tight fitting doors will stop closing and need to be adjusted.
Maximum doors size for fire ratings is influenced by but not limited to the following items.
Fire ratings for doors are influenced by but not limited to the following items.
Simpson offers thousands of choices for fire rated doors including 20 minute fire rated wood doors and mdf doors with fire ratings up to 90 minute.
How thick should my fire door frame or lining be.
Steel gage of the door example.
And since simpson fire doors have been designed to match other interior doors your fire rated doors will blend seamlessly with all doors in your home.
This could be achieved by fixing an addition 1 2 inch 12mm glued and screwed to the existing door stop.