We are currently drafting a fire report for a 3 level building, 2 level major dwelling above a single level minor dwelling (both with independent escape routes) and noted a change to the SH scope wording in the new C/AS2 which seems to clash with the still current C/AS1. The new C/AS2 has added wording “…no more than two levels …” in table 1.1, whereas C/AS1 just limits you to no more than one unit above another. Fig 1.1. in C/AS1 IMPLIES that you can’t have more than two levels?
Perhaps something else that MBIE needs to clarify in the next amendments? In the meantime we’re left wondering whether this house is risk group SH or SM (with the added requirement of a type 5 since the travel distances off the intermediate floor are greater than 20m when applying the 1.5 multiplier!).
If we elect to show compliance with C/AS1 someone could point out that MBIE guidance states it is clearly risk group SM so I guess we’re stuck with SM for now.