Mixing quick response & residential sprinklers in 13R

[SprinklerDesigner2]

I have a small residential building with sprinkler designed per NFPA #13R.

With the exception of a single sitting room all sprinklers outside the dwelling units are at 8'-0" but the sitting room (requires three sprinklers) has a vaulted ceiling that goes up to 13'-5" AFF and, since it is outside the dwelling unit, regular quick response sprinklers need to be used.

See image.

http://img222.imageshack.us/img222/8179/sparksw0.jpg

There is not a lintel between the vaulted ceiling sitting room and corridor... just an open passageway.

I don't think there is a problem mixing heads in this manner but I wanted to check here first.

Calculations? Three heads in the corridor (there are only three) and one or two in the sitting room?

TIA

 

[stookeyfpe]

I would accept it. The corridor under the IBC would require a minimum 30 minute fire-resistance rating so in my mind these are separate areas when applying NFPA 13.

 

[SprinklerDesigner2]

Stookey,

The corridors are rated separating the dwelling units but there is not any separation between the sitting room and corridor. I propose residential sprinklers for the corridor with quick response for the sitting room.

I think it is alright but something is bothering me about it. I suppose at worst case I could use extended coverage quick response sprinklers for the corridor but that would up my pipe size a bit. Lousey water and all theya re already two big.

PS The 1/2" shows up in the transfer as 1`. Most of the pipe you see is already 1 1/2" just because we had a lot of it in the shop we want to use up.

 

[cdafd]

just a question is this an assisted living facility?? or what is the use??

 

[SprinklerDesigner2]

cdafd,

Yes.

Georgia allows 13R systems in assisted living facilities.

 

[stookeyfpe]

My answer remains unchanged.

 

[Cidona]

Just thought I'd mention this 'in case', though it's not related to your question. Are you in an area prone to freezing? It looks like it will be diffucult to provide sufficient insulation above the branchline shown going down the slope of the roof if you are.
Might be able to feed sidewalls from south end of south sleeping rooms instead?

 

[SprinklerDesigner2]

Cidona,

As close to Florida as you can get without actually being in Florida. I got aligators living within a half mile of my house so it doesn't get that cold. Lowest January temperature I've seen is 27 Deg. and that extreme cold last only a few hours at most.

I doubt attic pipe would freeze but it's standard we still cover pipe with batt insulation. Checking records our all time recorded low was down into the teens.

 

[Cidona]

Good news! I'm In Chicago here so no alligators but lots of freeze upsWe'd have to have that joist space filled with insulatin and have the bracnhline below that.