The 2015 Edition of the International Fire Code added some clarity for water supply for buildings with automatic sprinkler systems.
The Annex B material (not enforceable unless adopted) states:
B105.3 Water supply for buildings equipped with an automatic sprinkler system. For buildings equipped with an approved automatic sprinkler system, the water supply shall be capable of providing the greater of:
1. The automatic sprinkler system demand, including hose stream allowance.
2. The required fire-flow.
In the past I've heard several people say that only inside hose allowances are included when determining the total volume required (which sizes the water storage tank). Would you interpret this section of IFC to include both the inside and outside hose allowance?
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