20230041.1_McClintock_High_School_-_Structural_Evaluation_for_HVAC_RTU_-_Final.pdf

This document is a Structural Assessment report prepared by Advanced Structural Engineering (ASE) for the Tempe Union High School District, specifically focusing on the roof structure for Building 700 at McClintock High School located in Tempe, Arizona. The assessment, dated November 2024, was conducted to evaluate the structural capacity of the existing roof framing to support a new rooftop mechanical unit (RTU). The scope of work included a site visit on August 26th, 2024, review of record drawings, evaluation of structural loads based on the International Building Code (IBC), and structural calculations to determine the load-carrying capacity of vertical elements.

The report identifies that the proposed new mechanical unit (UMP-939D) weighs 1,472 pounds, which is higher than the existing unit's weight of 1,300 pounds. Based on the structural analysis, the existing roof framing is unable to sustain the capacity to support the new rooftop mechanical unit. As a result, ASE recommends introducing a channel section or angle at the junction between the RTU supporting member and the joist to enhance the load-bearing capacity and address potential structural integrity concerns. The assessment was limited to the roof framing system in the area under the mechanical unit replacements and included only visual observations of readily accessible structural elements.