BS 8214:2016 pdf download. Timber-based fire door assemblies – Code of practice.
4 Determination of fire resistance of doors COMMENTARY ON CLAUSE 4 The fire resistance of a door assembly is determined by subjecting a full-size construction to test in accordance with the procedures laid down in the appropriate fire resistance test standard, i.e. BS 476-22 or BS EN 1634-1. The test standard requires the tested construction to be fully representative of the assembly to be used in practice in terms of materials and methods of construction, size, number of leaves and mode of operation, including all glazed openings and essential door hardware. The fire resistance is expressed in terms of the number of minutes for which the assembly meets the relevant criteria. Depending upon the test standard used for the evaluation, the criteria would be either integrity or insulation. For the purposes of classification, doors are classified to the last specific fire resistance period that has been passed during the test before failure occurs. Where more than one criterion is identified during the test, it is possible that for each of these criteria a different classification period might apply (see BS EN 13501-2). Recommendations on the required classification period for a particular application are provided by either regulatory guidance or relevant design standards (such as BS 9991 and BS 9999), as well as individual designs carried out according to BS 7974. The building designer should ensure that all fire doors to be used are of a design that has been tested or subjected to assessment for the required fire resistance period, and that documentary evidence exists to that effect.
Where the elements of a fire door are to be obtained from different sources, the building designer should ensure that the elements to be used are compatible and are able to provide the required fire resistance period, and that documentary evidence exists to that effect. Before proceeding with contractual commitments it should be established that evidence of performance exists which meets with the approval of the enforcing authority. NOTE 1 When it is impossible, due to size or other constraints, or is impractical, to evaluate the constructions by test then it is appropriate to have the potential fire resistance of the construction determined by way of agreed expert opinion based on existing test evidence. This course of action might be required when evidence of performance of a particular component has been established in connection with another form of construction. As a successful fire resistance performance is often the result of complex interactions between materials it can never be assumed that a result obtained under one set of circumstances will be conferred on a different combination of components or materials. It might be possible, however, for the proposed combination to be determined as suitable by a competent expert, on the basis of evidence generated in other tests. NOTE 2 BS 9999:2017 recommends that door openings in compartment walls are limited to 25% of the wall length where the doors are uninsulated. There is no limit if the doors provide insulated performance at the appropriate level.BS 8214 pdf download.