Appeal 33441

OSSC 2022 Table 705.2 & 705.5.

Exterior walls less than 10 feet from the assumed property line shall be one-hour fire resistive rated. Walls greater than 10 feet from the property line can be non-rated (Table 705.5). Projections from exterior walls 5 feet or greater from the property line, shall have a minimum distance of 40 inches from the property line (Table 705.2).

Due to existing conditions and the large overhangs, allow 1-hr fire-rating of the new wall greater than 10 feet from assumed property line, rather than fire-rating the existing wall less than 10 feet from assumed property line.

See attached code plan (1/G-105) and elevation (3/G-104). Locate the assumed property line 5’-0” from the existing satellite 4 building wall. This is 3'-5" inches from the overhang on the new building. Satellite 4 has an approx. 12” overhang on this end. Install 5/8” type x gypsum sheathing on the exterior of the existing wall of the satellite 4 building. Construct the east exterior wall of the new building, as 1-hr fire-rated construction. Two door openings in the new exterior wall will be fire-rated to 45 minutes, per table 716.1(2).

The proposed new building (type V-B) has a large overhang (7’-0”) and is fully-sprinklered. Per 705.2.3, the overhang projection is both: made of heavy timber construction complying with Section 2304.11, and has sprinkler coverage per 705.2.3.1. Constructing the new east exterior wall of the new building as 1-hr fire-rated construction, will provide additional protection.
The proximity of these buildings is a temporary condition. The existing satellite 4 building is planned to be removed in a later project phase in 1 -2 years.

1009.1 Accessible Means of Egress

Where more than one means of egress is required by Section 1006.2 or 1006.3 from any accessible space, each accessible portion of the space shall be served by not less than two accessible means of egress.

Allow one accessible means of egress where a single means of egress is permitted, where rooms exit directly to the exterior.

See attached code plan (1/G-105). On the upper level, all classrooms have an exterior exit door, facing a mostly enclosed courtyard/ play area at grade. The walkways are mostly covered and have sprinkler coverage, but the central play area is not covered. There are no interior exit corridors. Sectors F and H are provided with two accessible means of egress. One egress path is an accessible route at grade to the right-of-way. The other path uses an exterior exit stairway (per OSSC 1027), with an exterior area for assisted rescue (per OSSC 1009.7). At Sector I, one (1) accessible exit is provided. Two (2) total accessible exits are provided from the courtyard. One to the north, and another via the west stair.

Per 1006.3.4 (2), a single exit is permitted from any story where:
"Rooms, areas and spaces complying with 1006.2.1, with exits that discharge directly to the exterior at the level of exit discharge...."
Per 1006.3.4, on the upper level of this building, each sector requires one (1) exit. At least one (1) accessible means of egress is provided from all spaces. Two (2) accessible means of egress are provided from the central courtyard/ play area.