Gaps between fire doors and the door frame should never be more than 4mm or less than 2mm. It’s recommended to aim for a 3mm gap to ensure adequate room for the intumescent strips to activate in the event of a fire, and for the smoke seal strips (if installed) to not get damaged by the opening and closing of the door.
The gap at the bottom of the door is usually around 10mm* for non-smoke conditions BUT 3mm when smoke seals are required.
What should you never do to a fire door?
Never leave a fire door wedged open
Apart from the obvious consequence of potential loss of life, or injury, and damage caused by a fire spreading throughout a building, it is actually illegal for a fire door to be propped open. As such, all fire doors MUST be fitted with an automatic closing system.
How much of a gap should be between door and floor?
The Standard Gap Between Interior Doors and the Floor
When it comes to installing interior doors, your focus should be on ensuring that the door opens without scraping past the floor material. This typically means maintaining a gap of no more than half an inch (1.27 cm) for such finished floors.
Intumescent strips should be fitted into the fire doors frame or lining, where possible. … The gap at the bottom of the door (commonly referred to as ‘the threshold’) is usually around 10mm* for non-smoke conditions BUT 4mm when smoke seals are required.
Should a door frame touch the floor?
Yes, as long as the rough opening allows you to true up the door for proper operation. Quote: the metal exterior sill that comes with the prehung door now sits a touch higher than the finished floor.
How do you fill large gaps around a door frame?
One of the easiest ways to fill door gaps is to use weatherstripping. You can use sticky foam tape; tubular silicone, vinyl or rubber; corner pads; felt rolls or one of the weatherstripping kits sold in stores. If old weatherstripping is already on the door, take it off and clean the frame with rubbing alcohol.