Do I need hydrants to basement levels during construction?

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A description of how Volume One E1.9 Fire precautions during construction applies to hydrants in a building under construction.

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Do I need hydrants to basement level during construction?

So Clause E1.9 says required hydrants must be operational in at least every storey that is covered by a roof, or the floor above, except the top two storeys when the building reaches an effective height of 12 metres under construction. When we measure effective height, we measure from the lowest storey calculated in the rise in storeys. So there's a couple of definitions here that we need to understand. The first is the definition of a storey.

This definition describes what a storey is, and it doesn't matter if it's above or below ground, if it's got a floor, and a ceiling or a floor above it, then it's a storey, and therefore it is subject as E1.9. So the basement requires hydrant protection during construction once the effective height hits 12 metres. Pretty clear, so why the confusion?

Well quite likely it's confused with the meaning of rise in storeys which is a calculation found in C1.2. And this is only about storeys above ground. But, as we just saw, E1.9 applies to all storeys as defined. It could be a confusion with effective height which is only about the storeys above ground. But as we just saw, E1.9 applies to all storeys.

So with the exception of the top two floors, these are the locations of required hydrants in a building during its construction, once its reached 12 metres in effective height.

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