Help To Understand the Required Separation between Groups F1 & B

[Attararc]

Hello everybody,

I need a help to understand the separation requirements between groups F1 & B,

i am working on a Factory; my analysis for the project as follows:

- Occupancy classification is F1 and it can be considered a special industrial occupancy (201,000 sq.f)

- One story

- Construction type is IIB

- To be unlimited area the sprinkler is required & it shall surrounded and adjoined by public ways or yards not less than 60 feet (18 288 mm) in width.

- Laboratory building one story is adjacent to the factory (17,000 sq.f), I considered as an accessory occupancy.

- An office building 2 stories beside the laboratory is adjacent also to the factory (9,400 sq.f each story).

- Office building construction type is IIB

The question is: Which table from the IBC 2009 I have to apply for the required separation between the factory & office building; Table 508.4 (no separation required between F1 & B) or table 706.4 ( 3 hours fire resistance rating for Group F1)? And is the separation still required if the sprinkler provided in the office building?

Is the separation required between the laboratory & office building?

Please correct me if my analysis is incorrect.

Thanks in advance for your help.

 

[cda]

I would say the lab building carries it own occupancy not accessory

Your not in calif are you

 

[cda]

Not ibc expert but

Would say 508.4 applies

706.4 is used if you are trying to get to separate buildings

 

[Attararc]

no I'm not in Calif

if the lab is not accessory, I will classify it group B, and in this case what is apply to the office building will be applied to the lab.

 

[cda]

""Is the separation required between the laboratory & office building?"

Two different buildings???

 

[Attararc]

""Is the separation required between the laboratory & office building?"Two different buildings???

actually there is an expansion joint between the lab & offices, therefor a double wall is provided.

i think they can be considered as a one building.

 

[cda]

Sorry some how I read the op wrong and made two buildings out of one

Still do not think it is an accessory I have to read that section

 

[Codegeek]

I'm not following the issue if it's being classified as an unlimited area building as no separations are required for unlimited area buildings. Based on the square footage you've indicated, the building has to be unlimited area as the 200,000+ square feet would not be permitted unless it was Type IA or IB construction.

Am I missing something?

 

[RLGA]

Attarac: I think some information is still missing. You state the office and lab "buildings" are connected. However, you don't state how the connected office/lab "buildings" relate to the factory. Are they connected, too? Also, what is the construction type of the lab?

If the factory is connected to the other buildings, they can all be considered one building (provided all are of Type IIB construction) with unlimited area per Section 507.4 (2012 IBC), since the the office building is two stories.

If they are not connected, then they could still be considered as one building per Section 503.1.2 (2012 IBC). The area limitation would be based on the most restrictive construction type of all buildings considered. For example, if all buildings are to be considered as portions of one building per Section 503.1.2 and two buildings are Type IIB and one building is Type IIIA, then the Type IIIA construction type will be the one used to determine allowable area. But, if the aggregate building area is surrounded by 60-foot yards or public ways, then the unlimited area provision of Section 507.4 would be applicable, regardless of construction type.

Also, special industrial occupancies are exempt from the height and area limitations; however, you should have the building official's acceptance of this approach before relying on it

 

[Attararc]

- may I should consider the lab & offices as one building, the lab is beside the offices and there is an expansion joint between them; both of them (lab & offices) are adjacent to one edge of the factory.

- all buildings have the same construction type IIB.

- the factory is connected to the lab & offices.

in this case what is the required separation between the factory (F1) & the offices/lab (B)?

Any guidance in this matter would be appreciated.

 

[kilitact]

- may I should consider the lab & offices as one building, the lab is beside the offices and there is an expansion joint between them; both of them (lab & offices) are adjacent to one edge of the factory. - all buildings have the same construction type IIB.

- the factory is connected to the lab & offices.

in this case what is the required separation between the factory (F1) & the offices/lab (B)?

Any guidance in this matter would be appreciated.

No separation required between b and F-1. The fire sprinklers and 60 foot yards per 507.4 allows two stories to be unlimited in area.

 

[RLGA]

Agree with kilitact--if area is unlimited, there is no required separation between any of the occupancy groups you listed.

 

[Attararc]

thanks to all of you for the helpful information.