What is the maximum gap under a fire door?

NFPA 80 currently allows a maximum bottom gap of 3/4 in. and a maximum of 1/8 in. for the perimeter (e.g. along vertical and top edges) of the swinging fire doors (with an additional 1/16 in. over-tolerance for steel doors).

What is the maximum gap around a fire door?

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.

How much can you undercut a fire rated door?

According to section 8.3. 3.1 of the 2012 Life Safety Code, you must install fire-rated door assemblies in accordance with NFPA 80-2010. Section 4.8. 4.1 of NFPA 80-2010 says the clearance under the bottom of the door shall be a maximum of ¾ inch.

What is the allowable edge gap for a 90 minute fire rated door?

Maximum allowable door bottom gap is 3/4". Gaps that exceed these maximum allowable tolerances result in a non-compliant fire door that needs to be repaired.

What gap should be under a door UK?

the gap between the underside of the door and unfinished floor should be between 10mm and 22mm. The ventilation requirements for the building need to be taken into account when determining the gap beneath internal doors.

How to Check Fire Doors - The 5 Step Check

What are the fire door regulations?

At all levels, each stairwell door must be a fire door, leading to a safe room in domestic buildings with more than two levels. Furthermore, in a mixed-use building, fire doors are required between the residential and the business spaces; and between the integral garage and house in the case of loft conversions.

How much clearance does a door need?

Remember there should be a gap of 2mm (about the width of a nickel) around the sides and top and a gap of 8mm on the bottom. An easy way to check the top and bottom is to sit the door on the floor. The gap at the top should now be 10mm (2mm top+8mm bottom).

Can a fire door be undercut?

Approved Document F – Ventilation

For a 762 mm wide door, this represents a 10 mm gap, (reducing to 8 mm for a 926 mm wide door). This can be achieved by making an undercut of 10 mm above the fitted floor finish.

How are fire door clearances measured?

How much gap should be between door and threshold?

The gap at the bottom of an interior door should be 2 inches from an unfinished floor. Over a finished floor, the gap should be between ¾ to ½ of an inch, depending on the type of floor you have. The gap at the bottom of an exterior door should be almost nonexistent.

What is a typical door undercut?

Doors are undercut to provide clearance above the finish floor material. Typically they are undercut ⅝ inches to ¾ inches from the bottom of the frame. Clearance is defined as the dimension from the bottom of the door to the bottom of the finished floor material.

What are door undercuts?

Stairways recommended threshold and tolerance for undercuts, from the bottom of the door to the bottom of the frame. Doors are undercut to provide clearance above the finish floor material. This is critical when installing a fire rated door set.

What is the purpose of undercut door?

Door undercuts are commonly used to provide a return air pathway from rooms with closed doors. (Source: Steven Winter Associates.) To determine if an adequate pathway exists for air to return to centrally located returns, the following room-to-room pressure measurement can be used: Turn on the air handler to high.

Do you need intumescent strip at bottom of door?

In the event of a fire, without the intumescent strips, the door would not prevent the spread of fire for half as long, thus putting the residents or occupants of that building at much higher risk of injury and/or death. Fire doors play a crucial role in preventing the spread of fire and smoke.

Do fire doors need seal at bottom?

Do I need to fit seals on my fire door? ALL fire doors MUST be fitted with the appropriate seals. They are designed to expand under heat, and fill the gaps between the door leaf and frame, thereby preventing the passage of smoke and fire to other parts or compartments of the building.

Do fire doors need 3 hinges?

All fire doors are required to have 3 hinges, which must be fire certified. All fire door hinges should be CE marked along with a fire identification stamp which are easily visible.

What is a door gap?

door gap dimensions must be with- in NFPA 80's specifications along the full height of the vertical edges and across the full width of the doors at the top and bottom. ...gaps are measured at the. outermost leading of the doors and the rabbets of the door frames.

How do you check a door clearance?

Measure the door opening width at the top, middle and bottom of the door frame. Be sure to measure from left to right, in between the rebates, where the door will sit. Measure the door opening height at the left and right hand sides of the frame. Standard clearance of 10mm should be allowed under the door.

How do you use a gap door gauge?

Place the gauge in the palm of your hand. Then stick the door gap gauge in the gap at the door and between the frame. The gap gauge should fit accurately in the space between the door and the hollow metal frame, sliding along the whole length of the space along the leading and vertical edges.

Can you shorten a fire door?

One of the most common queries about fire doors is how much material can be trimmed off the sides of a fire door. This may be for the purposes of fitting a new fire door into an existing fire-resistant. The short answer is: there is no general, recommended, or mandatory amount on a fire door that can be trimmed.

Can you alter a fire door?

Yes! You can make some alterations provided they are within the scope of the fire door's 'Certifire Approval' documents (CF). This information is also contained in the installation and maintenance instructions supplied with each door leaf.

Does a fire door have to have a threshold?

Thresholds are not typically required by the codes and standards for fire door assemblies, although there may be a need for them when combustible floor coverings are used, depending on the critical radiant flux and the rating of the fire door assembly.

What is the gap between door and floor called?

This gap is also called bottom clearance, and the top gap is called head clearance, while the side gaps are called stile clearances at taylordoors.com.

What is the gap between door and frame called?

When two individual windows or a door and window are joined, the seam between the frames of the two units is called the mull, which is short for mullion. In this case, a door jamb has been joined to a window/sidelight jamb.