Performance of fire-resisting timber doorsets

Date Published

10 August 2022

Document Type




Fire-resisting doorsets are required to be able to contain a fully developed fire, to facilitate escape of a building’s occupants and allow fire-fighting, and to protect the structure from the effects of fire. The doorset therefore must have resistance to fire, expressed in terms of time.

This Wood Information Sheet is intended as a guide to architects, quantity surveyors, building surveyors, building control officers, fire prevention officers and builders. It compares the various performance requirements for timber fire-resisting doorsets and makes recommendations on their specification.

Key Information

The bulding regulations and most fire protection/prevention codes call for a minimum performance with respect to integrity.

To determine the fire resistance time, adoorset is exposed to a ‘standard’ fully developed fire in a test furnance until failure occurs according to certain criteria.

There are some requirements regarding radiation effects and insulation to resist the rise in unexposed face temperature.

Case studies

The Savill Building is a new visitor centre for the Great Park, the historic 14,000 acre (5,665ha) forest and woodland park to the south of Windsor.

On a Thames-side site which regularly floods, March House by Knox Bhavan architects has been designed for longevity by embracing the agency of the river.