How to Inspect and Measure Fire Door Gaps

Checking the gap around a fire door sounds straightforward. Get a gauge, measure the gap and write the figure down. The pattern matters as much as the number. Where the measurements change, compare them with tapered fire door gap patterns before deciding what needs adjustment. There is a bit more to it than that. The gap can tell you a lot about how the door and frame are sitting together, especially when you take a number of measurements and compare them. A fire door shouldn't just be checked at one convenient point. You need to look around the whole door and see what the gap is doing. What Should the Fire Door Gap Be? For the normal gap between the door leaf and frame, the commonly used figure is: 3.0 mm ± 1.0 mm So you're generally looking at 2.0–4.0…