S2 - B Use - Firewall 9000 Sq Ft

[RLGA]

Yes, the office is framed out inside, thus it does not go all the way to the ceiling. The wheels of course are not combustible -- just wheels. I also have an area where we work out and roll stuff in and out that has a wall unit on it, and it has the hanging meat locker like plastic strips. Does this also have to have the 2 hour barrier? It is kind of crazy as I really do not see the purpose of the barrier. Everyone can walk from their office to the front door in under 5-10 seconds!!

It depends on where that opening is located. If you plan on separating the Group B area from the Group S-2 area with a 2-hour fire barrier, then any opening in that fire barrier must have a 1-1/2-hour rating.

Does your building have at least 20-foot open spaces all around the perimeter? If so, you can get a 50% increase for frontage; thus, increasing your allowable area to 13,500 sq. ft. for a nonseparated Group B building.

 

[classicT]

Does your building have at least 20-foot open spaces all around the perimeter? If so, you can get a 50% increase for frontage; thus, increasing your allowable area to 13,500 sq. ft. for a nonseparated Group B building.

For the OP... Keep in mind that you would measure to an imaginary lot line between buildings on the same lot.

Where you have multiple buildings on a site, you may either treat them all as one building, or they must be separated by an imaginary lot line. Assuming Type V-B construction again, but if the buildings are less than 20-ft apart, some of the exterior walls would need to be rated construction where using the imaginary lot line method. This comes out of IBC Table 602 and IBC Section 503.1.2.

503.1.2 Buildings on Same Lot
Two or more buildings on the same lot shall be regulated as separate buildings or shall be considered as portions of one building where the building height, number of stories of each building and the aggregate building area of the buildings are within the limitations specified in Sections 504 and 506. The provisions of this code applicable to the aggregate building shall be applicable to each building.

 

[RLGA]

For the OP... Keep in mind that you would measure to an imaginary lot line between buildings on the same lot.

That is incorrect for frontage increase. See Section 506.3.2 (2018 IBC), third item.

 

[classicT]

That is incorrect for frontage increase. See Section 506.3.2 (2018 IBC), third item.

Good catch.