23 235649 ALT

Project Description

Project Scope - Full Interior Alteration - Reference 20 113679 BLD 00 BAPurpose of this Alternative Solution Application - Additional location(s) EJ-6a of Spray Fireproofing Substitution product from approved Alternative # 21 121575 ALT 00/ 22 232419 ALT 00 and EJ-6b intepreting plaster protection. Throughout the project, several existing assemblies and structural members have been found to not meet the required fire-resistance rating when calculated using MMAH Supplementary Standard SB-2. Each of these conditions was previously assessed to determine the required additional fire protection measures to achieve the required fire-resistance rating of the assembly or structural element. This submission is for an Engineering Judgement for improving the fire-resistance rating (FRR) of an existing terracotta wall by relying on an enclosed airspace and continuous stone layer. This uses International Building Code equations for multi-wythe masonry walls, where enclosed air spaces have a quantifiable benefit on the FRR. This follows the same methodology as previously submitted and approved Alternative Solution 21 121575 ALT 00, approved on Mar 31, 2021.

Permit Details