Fire Rated Door Threshold Detail

Not all doors in a commercial building need to be fire rated.

Fire rated door threshold detail.

Our facility undergoes routine inspections to verify that modifications are. I treat the threshold as part of the sill assembly. Standard steel doors can be provided with a variety of louver designs and sizes. This publication contains explanations and details of louver designs that are most commonly available within the standard door industry.

Trudoor is an authorized whi fire labeled shop warnock hersey intertek enabling us to modify re certify and label fire rated doors and frames. Commercial fire rated door requirements are typically determined by the fire rating of the wall and use of the door. 111 c recommended louver details for standard steel doors. Vestibules that are part of a smokeproof enclosure horizontal exits and elevator lobby doors in occupant evacuation elevator shaft systems.

Bs9999 2008 recommends for fire doors with cold smoke control that the threshold gap should be either less than 3mm in height or should be fitted with a threshold seal. When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. 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. Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up to 90 minutes.

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.