Unlimited area and separated uses

[kasa]

2015 IBC. In an existing type 1A building, will be changing use to A3, R1 & S1…. The S1 is to be separated by 1hr construction. It will be fully sprinkled. Can the rest of the building then be unlimited area?

 

[mtlogcabin]

No an R occupancy will limit the size of the building

 

[kasa]

Sorry, checking my notes, it's type 1B construction...

Will R still limit it?

 

[mtlogcabin]

I believe you have to be a IA construction type to make it work in a mixed use building. If the S1 can meet the "accessory" requirements it should work

 

[RLGA]

All occupancy groups mentioned are permitted to have unlimited area, so no occupancy separation is required unless another section requires fire-rated separation (e.g., control areas, fire areas for limiting sprinkler protection, etc.).

 

[steveray]

Area might work, but the stories might be limited...How many and where are the occupancies located?

 

[RLGA]

Area might work, but the stories might be limited...How many and where are the occupancies located?

Unlimited height is permitted per the occupancies listed, provided the sprinkler system is per NFPA 13. If the sprinkler system is per NFPA 13R, then the entire building is limited to 60 feet and 4 stories regardless of where the occupancies are located.

 

[steveray]

S1 area is limited by T506.2 for IB, but 507.5 gives you 2 stories of unlimited S1...No?

 

[RLGA]

S1 area is limited by T506.2 for IB, but 507.5 gives you 2 stories of unlimited S1...No?

The OP said it was Type IA construction, so there is no need to use Section 507.5. Section 507.5 would be applicable to construction types that do limit the building area.

 

[steveray]

Post #3

Sorry, checking my notes, it's type 1B construction...

Will R still limit it?

 

[RLGA]

Post #3

Ah, I missed that. Thanks.