PaulJi
Member
Given: CCB 2010 (IBC 2009): 2Story, Type III-B, Fully Sprinklered, A-3 & B occupancy groups.
Total Gross Building Area - First Floor = 25,923 sf = A-3 occupancy + B occupancy
Total Gross Building Area - Second Floor = 25,923 sf = B occupancy
At = 9,500sf for A-3 with area increases for frontage and sprinklers the Allowable area is 35,625 sf.
The situation on the first floor is:
Hallways = 941 sf
Toilets = 2,429 sf
B-Occupancy = 1,760 sf
A-3 Occupancy= 20,793 sf
I'd like to use the Sec. 508.3 Nonseparated occupancies method.
My question or confusion is how to handle "accessory areas" (that do not count toward occupant load )such as hallways and toilet rooms. I realize occupant type is different from occupant load.
The Hallways and Toilets appear to be "accessory or occupancies that are ancillary to the main occupancy (A-3) of the building" however when I look at Sec. 508.2.1 Accessory occupancy area limitations it limits the aggregate accessory occupancies to 10% of the building area of the story At value. In my case, that would be 950 sf. As noted above toilets and hallways exceed 950 sf. Hallways and Toilets are not specific to any Occupancy classification as referenced in in Sec 508.2.2 to Section 302.1.
I understand the requirement to limit accessory occupancies such as those listed in Sec. 302.1 ... ie F, B, I, H, etc as they carry with them occupant loads but toilets to my knowledge are not specific to these groups and in the case of A classification types do not have an occupant load.
It seems to me that area required for the toilets (that the Mechanical Code requires) should be considered accessory occupancies that are not restricted by Section 508.2. That Section 508.3 should be sufficient to classify these (non-occupant load contributing spaces) as A-3 occupancy classifications.
This is probably as clear as mud ... it is to me...but I'd appreciate if anyone could clarify the classification of these "ancillary" "non-load" spaces and whether Sec. 508.2.1 applies if at all?
Total Gross Building Area - First Floor = 25,923 sf = A-3 occupancy + B occupancy
Total Gross Building Area - Second Floor = 25,923 sf = B occupancy
At = 9,500sf for A-3 with area increases for frontage and sprinklers the Allowable area is 35,625 sf.
The situation on the first floor is:
Hallways = 941 sf
Toilets = 2,429 sf
B-Occupancy = 1,760 sf
A-3 Occupancy= 20,793 sf
I'd like to use the Sec. 508.3 Nonseparated occupancies method.
My question or confusion is how to handle "accessory areas" (that do not count toward occupant load )such as hallways and toilet rooms. I realize occupant type is different from occupant load.
The Hallways and Toilets appear to be "accessory or occupancies that are ancillary to the main occupancy (A-3) of the building" however when I look at Sec. 508.2.1 Accessory occupancy area limitations it limits the aggregate accessory occupancies to 10% of the building area of the story At value. In my case, that would be 950 sf. As noted above toilets and hallways exceed 950 sf. Hallways and Toilets are not specific to any Occupancy classification as referenced in in Sec 508.2.2 to Section 302.1.
I understand the requirement to limit accessory occupancies such as those listed in Sec. 302.1 ... ie F, B, I, H, etc as they carry with them occupant loads but toilets to my knowledge are not specific to these groups and in the case of A classification types do not have an occupant load.
It seems to me that area required for the toilets (that the Mechanical Code requires) should be considered accessory occupancies that are not restricted by Section 508.2. That Section 508.3 should be sufficient to classify these (non-occupant load contributing spaces) as A-3 occupancy classifications.
This is probably as clear as mud ... it is to me...but I'd appreciate if anyone could clarify the classification of these "ancillary" "non-load" spaces and whether Sec. 508.2.1 applies if at all?
