Fire Rated Door Threshold Detail

Trudoor is an authorized whi fire labeled shop warnock hersey intertek enabling us to modify re certify and label fire rated doors and frames.

Fire rated door threshold detail.

The construction at the fire door is tricky especially when the fire walls are type v construction using a u300 or u400 series fire wall assembly. Standard steel doors can be provided with a variety of louver designs and sizes. When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. This publication contains explanations and details of louver designs that are most commonly available within the standard door industry.

For example nfpa 101 currently requires smoke leakage rated assemblies for new fire doors serving an area of refuge and requires compliance with nfpa 105 for new door assemblies in three locations. Not all doors in a commercial building need to be fire rated. 111 c recommended louver details for standard steel doors. Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up to 90 minutes.

I treat the threshold as part of the sill assembly. And we are certified by ul to cut re certify and label fire rated glazing materials. Our facility undergoes routine inspections to verify that modifications are. Product overview fire rated steel doors for commercial industrial applications.

Commercial fire rated door requirements are typically determined by the fire rating of the wall and use of the door.