BS 15254-4:2018 pdf download – Extended application of results from fire resistance tests – Non-loadbearing walls Part 4: Glazed constructions
4.1 General principles Extended application is a prediction of the expected fire resistance of fire resistant glazed elements. It may be based on interpolation between or extrapolation from test data. The fundamental consideration shall be that the fire resistant glazed element after extension would achieve the required fire performance if it were to be tested according to EN 1364‑1:2015.
The test results are applicable to similar constructions where one or more of the changes in the direct field of application in EN 1364‑1:2015 and this standard are made, and it is the manufacturer’s responsibility that the construction continues to comply with the appropriate design code for its stiffness and stability.
For test reports based on an edition of EN 1364‑1 earlier than 2015, the direct field of application according to EN 1364‑1:2015 may be applied. An increase in the classification time (e.g. from EI 30 min to EI 45 min) and/or changes to the fire performance classification (e.g. from E to EW) achieved in the reference test shall not be permitted by the application of the extended application rules. The only exception is detailed in 7.2.
The overview regarding the relevant changeable parameters for extended application for fire resistant glazed elements is given in Table 1. Extended application reports shall be prepared according to EN 15725.
Fire resistant glazed elements function as an integral system in which the individual components (glass, glazing system materials and framing system) are combined in such a way that they are effective in meeting the defined fire resistance criteria. However, in this document fire resistant glazed elements are separately characterized as the glazing system and the framing system (see example in Figure 1).
4.2 Use of test evidence
The applicant for the extended application shall either be the “owner” (i.e. sponsor) of all reference tests and pre‑existing test data being submitted for the extension, or have written permission from the owner to use the submitted test evidence.
4.2.2 Reference tests Reference tests are the basis for any changes. For some of the changes an overrun time is required in accordance with EN 1364‑1:2015. A reference test may be submitted for either rectangular or non‑ rectangular panes. Reference tests provide the main source of data to determine the following:
— resistance to fire classification (integrity E, integrity with radiation EW or integrity with insulation EI);
— maximum pane area and dimensions for the fire resistant glass;
— maximum dimensions of the fire resistant glazed element for each type of frame;
— side exposed to fire. Reference tests may also provide other data to assist in determining the following:
— permitted dimensional changes to the framing system;
— changes to the glazing system.
4.2.3 Use of pre-existing test data Pre‑existing test data may be used to support extended application, for instance to evaluate the influence of a particular component (e.g. glazing material) or aspect of the design (e.g. direction of fire exposure) or to establish which design variations affect the performance in the most or least onerous way. If this can be identified, then a reference test of the most onerous design may be undertaken. If the product achieves the required classification then the other less onerous variations will be covered. The relevant clauses state when pre‑existing test data may be used.
4.3 Combination of extended application Within the extended application, a combination of changes is allowed (see Clauses 5, 6 and 7), provided that each change needed for these combinations can be substantiated by the supporting test evidence and/or pre‑existing test data. An extended application that has already been granted can be used for a new extended application, provided it can be shown that the new changes do not contradict any of the principles used to establish the first extended application. For reasons of traceability, all supporting documents used for any extension should be referenced in the extended application report.