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Gap under doors

Guest Dave

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Hi, the steel doors in our building have gaps under the doors 8-9mm. Some of the steel doors have drop down seals on them but some don’t. Is a 10mm gap on steel door acceptable or should it be less?

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  • 2 weeks later...

For metal fire doors there is no standard for this so it must be as required by the particular door manufacturer. However, generally I would work on 10mm max for a fire door and where smoke protection is required seal the gap to the floor with a threshold seal/plate combination. If it is impractical to fit a threshold seal then the gap should be 3mm max.

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