Veterans Administration Healthcare Network Chillers and Roof Replacement

C&S provided mechanical, electrical, structural, civil, architectural, and asbestos abatement investigation services for the Veterans Administration Medical Center. The scope of work included preliminary concepts and layouts, program development, investigative services, preparation of contract drawings and specifications, cost estimating services, and construction phase services to replace two existing 750-ton chillers. C&S evaluated the feasibility of heat recovery for the condenser water by use of a heat pump system, which will, at a minimum, consider rejecting heat to the domestic hot water loop, hot water make-up, and/or the swimming pool. Design services included infection control design to conform and be in compliance with the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) Environment of Care Standards. Drawings conform to VA Construction Standards CD-4 and CD-5 and specifications were compiled from the VA Master Specification. Construction was be phased to allow for one chiller replacement at a time.

C&S also designed roof replacements for 7 different roofs at the facility. The roof of the hospital’s primary mechanical building is riddled with obstacles related to the equipment beneath. This challenging roofing and insulation replacement project included six roof areas with two types of existing systems, ballasted membrane and an asphaltic 4-ply built up roofing system.

To determine the existing conditions, C&S arranged for test cuts down to the structural deck. Knowing exactly what is to be removed and what the remaining substrate is, is critical in designing a new system and controlling costs. The detailing accommodated over 30 different types of penetrations including hot and cold pipe flashing, mechanical equipment dunnage, safety rail posts, large pipe penetrations, smoke hatches, skylights, and many more different types of obstacles. Due to high traffic, an 80-millimeter thickness, reinforced felt back membrane was selected. Furthermore, large quantities of protection pads were incorporated into the final layout.