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APPEAL SUMMARY

Status: Decision Rendered - Reconsideration of ID 11253
Appeal ID: 11423 Project Address: 13 NE 3rd Ave
Hearing Date: 12/31/14 Appellant Name: Samir Mokashi
Case No.: B-008 Appellant Phone: 5034885651
Appeal Type: Building Plans Examiner/Inspector: David Jones
Project Type: commercial Stories: 21 Occupancy: R-2, B, A-2, S-1, S-2, M Construction Type: I-A
Building/Business Name: Fire Sprinklers: Yes - THROUGHOUT
Appeal Involves: Reconsideration of appeal LUR or Permit Application No.: 14-151030-CO
Plan Submitted Option: pdf   [File 1]   [File 2]   [File 3] Proposed use: Residential, Parking, Commercial

APPEAL INFORMATION SHEET

Appeal item 1

Code Section

602.2

Requires

Types I and II. Types I and II construction are those types of construction in which the building elements listed in Table 601 are of noncombustible materials, except as permitted in Section 603 and elsewhere in this code.

Proposed Design

The proposed design of the decking for the fifth floor amenity space at the Burnside Bridgehead uses Ipe wood decking material. Protection measures include:
• Noncombustible Type IA roof assembly construction under the deck;
• Decking is attached to non-combustible sleepers on concrete;
• Ipe plank decking has a flame spread less than 25, a ‘Class A’ flame spread;
• Decking is installed outdoors and indoors;
• Building tower occupants do not need to cross the roof decking to exit the building.
See the attached drawings and flame spread test results.

Reason for alternative

The proposed design uses Ipe wood decking as a walking surface on top of a concrete floor and roof assembly. The material, with a Class A flame spread rating, meets the intent of non-combustible materials in Type IA.
The floor deck assembly where the decking is used as an interior finish, meets the requirements for wood flooring in Type I construction per OSSC 805.1.2. The floor assembly under the decking, is a concrete slab with a fire-resistance rating of at least 2 hours and the decking is attached to fireblocking sleepers per OSSC 717.2.7.
The roof deck assembly is constructed of concrete deck with Ipe decking over metal sleepers on concrete piers. The structural concrete slab under the roof deck assembly provides the structure and the fire protection required for the roof for Type IA construction. The Ipe provides a walking surface for the occupied space and is not within 10 feet of any open flame device or flame cooking device.
Ipe decking qualifies as a Class A material, and is allowed as a roof covering in Type IA construction per 2010 OSSC §603.1 (3). The flame spread, of less than 25, meets the requirements for Class A roof materials.

The intent of 2010 OSSC §602.2 is to protect the structure of a Type IA building from materials that are combustible in order to allow additional building size. The Class A flame spread of the Ipe decking, combined with the 2-hour concrete roof, will limit the spread of fire and will minimally contribute to the fire load of the building. The attached flame spread test results, shows the spread of flame on the Ipe decking is less than 25. The outdoor nature of the amenity space means that smoke and hot gases, the primary threats to life safety from a fire event, will not collect and hinder egress

We believe the protective measure provided by the Class A flame spread rating of the Ipe, provides equivalent protection and we therefore request approval of this proposed design.

APPEAL DECISION

Ipe wood decking at roof terrace: Granted as proposed.

Note: sleepers and supports are to be non-combustible materials.

The Administrative Appeal Board finds that the information submitted by the appellant demonstrates that the approved modifications or alternate methods are consistent with the intent of the code; do not lessen health, safety, accessibility, life, fire safety or structural requirements; and that special conditions unique to this project make strict application of those code sections impractical.