Pontiac High School

Challenge

The School District of the City of Pontiac's 2020 bond program included infrastructure upgrades at Pontiac High School in Pontiac, Michigan. The project specification called for acoustic door assemblies rated at least STC 50, calculated per ASTM E413, at 17 openings. Many of those openings also had to carry a fire rating.

A sound-rated door performs only as well as its frame, seals, and hardware working together, so the package had to be selected and coordinated as complete assemblies rather than as separate parts.

Solution

In December 2021, Memtech Acoustics prepared a supply-and-install proposal for the door package for City Contracting Services, the contractor bidding the work. Memtech selected IAC Noise-Lock door and frame assemblies, factory assembled and pre-hung, all rated STC 51.

The package covered 13 single-leaf and 4 double-leaf openings with 2-1/2 inch steel leaves. Ten openings carried a 45 minute fire rating, five a 20 minute rating, and two were not fire rated. Each assembly included cam-lift hinges, self-aligning magnetic perimeter seals, concealed bottom seals, an integrated astragal on double-leaf doors, and factory-installed Schlage, Von Duprin, LCN, and Dorma hardware matched to the specified hardware sets. Memtech priced installation and freight with the package and updated its pricing for the contractor in July 2022.

Results

The contractor's door supplier ultimately included the sound doors in its own door package, so Memtech did not supply this project. The proposal shows how Memtech specifies acoustic doors: as complete, rated assemblies matched to each opening's STC, fire, and hardware requirements.