I'm interested to know what everyone is using to measure perimeter gaps on fire doors.

I've seen many inspectors using stepped brake pad gauges (such as the Hilka gauge set attached), while others use feeler gauges, dedicated fire door gap gauges, or calipers.

My main question is regarding accuracy when checking against the BS 8214 recommendation of 2-4 mm.

For those using stepped gauges:

• How do you determine whether a gap is 4 mm or 5 mm when the gauge jumps in 1 mm increments?

• If the 4 mm blade fits but the 5 mm blade doesn't, do you record it as compliant?

• Do you apply any pressure when inserting the gauge, or should it slide freely under its own weight?

I'm interested in hearing what methods people use in practice and whether there is any industry consensus on achieving consistent and repeatable measurements.

Many thanks,

So it depends whether you are inspecting doors profesionally, in which case you should use guages calibrated for accuracy.

If you are not acting in a professional capacity, choose the one you are most comfortable with.