The gap under the door can be slightly larger (up to 10mm) unless it’s a fire/smoke door, in which case it should also be less than 4mm - but it does depend on the door.

The cool thing about The Door Gap Gauge is that it is a multi-use tool that brings convenience for many. The gaps between a Fire Door and its frame need to be 2 to 4mm in width to ensure that both the door can close smoothly and that the fire cannot spread through the gap of the fire door. Look for a label, a plug or a similar marking on the top (or occasionally on the side) of the door to show that it’s certificated, and follow the instructions.Fire door accessories: recommendationsFire door accessories assist with legal compliance and overall health and safety measures. You should test them on a regular basis to ensure that they close effectively and you should frequently check to make sure there is nothing blocking them that would prevent them from closing. When a fire breaks out, a fire door can save your life, but it won’t if it isn’t properly installed, maintained and regularly inspected. Grab your gauge, find the size you are looking to confirm and insert the gap gauge under the bottom of the door and take an accurate measurement.

Watch the video to find out for your self that the Fire Door Gap Gauge is a simple to use, highly efficient “must have” tool that every inspector, fire marshal, commercial property/maintenance manager and fire department needs in their toolbox. This highly efficient device is an “essential” product for every single door carpenter, fire marshal, AHJ/IOR, maintenance supervisor, and fire department needs in their toolbox.If you'd like to know more about solutions that reduce your risks, make your buildings compliant and create safer environments for your people. The Hub features examples of construction industry best practice sourced from across the UK and Ireland. It is common practice to use a 3mm packer, however a packer is not calibrated and will not measure the door gap behind the front face of the door or frame.

This article by Lorin Neyer of California really puts a perspective on what the Fire Marshal is looking for when they inspect a fire rated door. Fire doors might be effective against the spread of flames, but smoke can still escape through gaps.Starting on the brush side of the self-adhesive fixing strip, peel off the backing paper and press the intumescent seal into position. The Scheme is a not-for-profit organisation founded by the construction industry to improve its image. Fire doors are a vital aspect of fire safety in any building, but they must be installed correctly and in good condition to ensure that occupants and escape routes are protected from the rapid spread of fire and smoke. His aim was for these recommendations to be adopted by owners and managers of all residential buildings, to prevent such a devastating incident from occurring again. For Steel Doors Swinging in sets the clearance between the top and the vertical edges of the door, the frame, and the meeting edges shall be 1/8 ″– 1/16 ″.