Appeal 33461

Appeal Summary

Status: DECISION RENDERED

Appeal ID: 33461

Submission Date: 9/5/24 8:54 AM

Hearing Date: 9/11/24

Case #: B-006

Appeal Type: Building

Project Type: Commercial

Building/Business Name:

Appeal Involves: Erection of a new structure

Proposed use: Multi-dwelling

Project Address: 2624 SE DIVISION ST

Appellant Name: Michael Perso

LUR or Permit Application #: Permit 21-117297-CO

Stories: 5 Occupancy: R-2, A-3, S-1 Construction Type: VA

Fire Sprinklers: Yes - THROUGHOUT

Plans Examiner/Inspector: JOHN COOLEY

Plan Submitted Option: pdf   [File 1]   [File 2]   [File 3]   [File 4]   [File 5]   [File 6]   [File 7]   [File 8]   [File 9]   [File 10]   [File 11]   [File 12]   [File 13]   [File 14]   [File 15]   [File 16]

Payment Option: electronic

Appeal Information Sheet

Appeal item 1

Code Section

713.4 (2019 OSSC)

Requires

713.4 Fire-resistance rating (2019 OSSC)
Shaft enclosures shall have a fire-resistance rating of not less than 2 hours where connecting four stories or more, and not less than 1 hour where connecting less than four stories. The number of stories connected by the shaft enclosure shall include any basements but not any mezzanines. Shaft enclosures shall have a fire-resistance rating not less than the floor assembly penetrated, but need not exceed 2 hours. Shaft enclosures shall meet the requirements of Section 703.2.1.

Code Modification or Alternate Requested

Approval of a fire barrier shaft wall assembly that is not a tested, listed assembly, but provides equivalent protection.

Proposed Design

The proposed wall assembly will have two layers of 5/8" Type X gypsum board on the shaft side of the wall and three layers of 1/2" Type C gypsum board on the non-shaft side of the wall. The structural members will be 2x wood framing on the flat (1.5" depth) at the corner, nested inside a 3 5/8" 97mil galvanized steel track. The framing space will be filled with 1.5" of mineral wool or glass fiber batts.

Reason for alternative

There is no tested, listed assembly for this wall type. However, several similar equivalents exists including: UL# U412 (same gypsum configurations, different steel stud configuration and no wood framing), UL# U301 (same gypsum configuration, 2x6 wood studs oriented conventionally) and UL# 263 (1" shaft liner, 1 5/8" minimum metal shaft stud depth, same configuration of gypsum board on one side)

Section 703.3, Methods for determining fire resistance, item 4 allows comparative assemblies:
Engineering analysis based on a comparison of building element, component or assemblies designs having fire-resistance ratings as determined by the test procedures set forth in ASTM E119 or UL 263.

While no exact match exists, two similar assemblies use the same gypsum board configuration on the shaft side of the wall, and a similar configuration on the non-shaft side of the wall. Two layers of 1/2" Type C gypsum board provide equivalent protection to two layers of 5/8" Type X gypsum board. A third layer of 1/2" Type C gypsum board is added to provide equivalency for the rating the framing and air space/insulation would provide in UL# U301 or U412. In the proposed equivalent detail, the stud space is not relied on to provide any portion of the rating. See attached Fire Engineer's report.

See proposed superseded details marked up on attached A8.02 and A8.03.

Appeal Decision

An alternate method for determining 2-hour fire resistance rating per engineered analysis: Granted as proposed.

"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.

Pursuant to City Code Chapter 24.10, you may appeal this decision to the Building Code Board of Appeal within 90 calendar days of the date this decision is published. For information on the appeals process, go to www.portlandoregon.gov/bds/appealsinfo, call (503) 823-6251 or come to the Development Services Center."