If this information is not available it seems reasonable to permit a gap of up to 8mm for general fire doors eg fd30.
Internal fire door gaps.
Weight height and width of a door.
Excessive fire door gaps are a significant problem to alleviate for hospitals and healthcare facilities with the recent updates in code compliance from the centers for medicare medicaid services cms.
In this case the reasonable error is 1mm.
I think it is too big and think a 1 4 1 2 gap would accommodate any unevenness in our floors and allow us to use area rugs.
The fire door gap gauge the fire door gap gauge is a must have tool for building inspectors iors fire marshals and ahjs for inspection of non rated and rated fire doors in warehouses office buildings hospitals and residential high rises.
According to the rules gaps are always calculated individually and depend on the geometric design parameters.
The gap between the door leaf and the frame must be suitable for the intumescent seal fitted.
There is an approximately 1 5 gap at the bottom of the doors.
For a private premises it is advised to install fire doors where the risk is most imminent for example the kitchen or rooms which house lots of electrical devices.
Ask your fire door manufacturer for their recommended threshold gap.
In general the gap should not exceed 3 mm.
If you have a requirement for cold smoke control eg fd30s your threshold gap should be less than 3mm or you should fit a threshold smoke seal.
To facilitate the checking of this gap on site the bwf certifire fire door and doorset scheme has produced a gap tester which can be used for this purpose.
First of all i should say that this subject is dealt with in detail by bs 8214 2016 timber based fire door assemblies code of practice.
If according to their dimensions a door must have 5 mm gaps between a leaf and a frame considering a possible error they can be from 4 to 6 mm.
My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout.