23 235657 ALT

Project Description

Project Scope - Full Interior Alteration - Reference 20 113679 BLD 00 BAPurpose of this Alternative Solution Application - Additional location(s) EJ-5b, EJ-5c of Spray Fireproofing Substitution product from approved Alternative # 21 121575 ALT 00. Remedial details EJ-7 -Terracotta patch and repair and EJ-8 - Precast Concrete patch and repair is submitted. 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 Engineering Judgements to provide a 2-hour fire-resistance rating (FRR) for existing structural steel columns that refines a previously submitted EJ using the actual size of steel columns. The previously submitted EJ utilized the lightest columns at the roof level in lieu of more detailed information to determine the thickness of additional spray-applied fire-resistive material (SFRM) required, while heavier columns in lower levels have been found to require less SFRM. Additional, Engineering Judgements have been provided for the remove and replacement of existing column protection that is required for installation of new elevator doorframes.

Permit Details