The fire resistance required of fire separations, compartmentation and fire stopping may need to be greater to compensate for the potential increase in fire severity.
The fire resistance / protection of non-combustible elements, eg steel and concrete in hybrid construction, may need to be greater to compensate for the potential increase in fire severity.
6
Mass timber elements may require oversizing above and beyond that set out in EN 1995-1-2 for standard fire exposure to account for strength loss during the decay and cooling phases.
It is not sufficient to specify a lining that achieves a classification established under furnace conditions, eg k 2 60. A separate dedicated analysis must be undertaken to quantify the performance of linings under realistic fire exposure conditions.
7
Self-extinguishment is only likely in compartments with a limited area of exposed timber structure. Therefore, the amount of visible timber may be constrained in instances where surviving burn-out is an objective. Self-extinguishment can be hampered by heat induced delamination, particularly in situations where multiple combustible surfaces can interact. This may affect adhesive choice and, thus, the supplier of cross-laminated timber (CLT).
8
The analysis scope of the fire consultant is likely to be increased as a detailed sensitivity / consequence analysis should be undertaken for all building types. Common failure modes might be identified, leading to a need to increase the redundancy of some fire strategy features.
9
Either smouldering combustion should be prevented or, through the QDR process and in the fire strategy, there must be an explicit communication with the fire brigade that intervention to stop smouldering may be a prerequisite of long- term stability.
10
Detailing should seek to mitigate smouldering as far as practicable, eg it may be desirable to avoid exposed timber in cavities and/or to avoid penetrations through timber construction.
F I R E
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