Medical Construction & Design

JUL-AUG 2018

Medical Construction & Design (MCD) is the industry's leading source for news and information and reaches all disciplines involved in the healthcare construction and design process.

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18 Medical Construction & Design | J U LY/AUGUST 2018 | MCDM AG.COM As the years go by, trends develop in any industry. The world of healthcare construc- tion is no diff erent, especially when it comes to the building envelopes sector. Construction teams must realize healthcare providers are designing and equipping facilities to meet both patient and market needs. And facility managers must have a fundamental under- standing of how a building envelope is designed and installed for the purpose of providing a boundary between the exterior environment and interior conditioned space. Healthcare facilities use a signifi cant amount of energy not only because of the 24/7 operations, but because of the amount of air that must be conditioned. Ventilation sys- tems must perform at optimal levels to ensure the quality of patient care. To achieve this energy-effi ciency goal, a building's usage should be taken into consideration when designing its enclosure system. The following trends are aris- ing in the healthcare construc- tion market as it relates to building enclosure systems. Trend #1: Custom- unitized curtainwalls One trend is a growth in build- ings utilizing custom-unitized curtainwalls with glass and glazing. A unitized system is well suited for buildings, such as healthcare facilities, that require both a large volume of prefabricated and higher- performance panels. This system's wall frame members are weather-stripped to seal to one another, both horizontally and vertically. This accommo- dates thermal expansion and contraction, inter-story dif- ferential movement, concrete creep, column foreshortening and seismic movement. Glass is becoming a more popular choice in curtainwalls because of its aesthetic appeal and allowance of letting in natural light. Glass and glazing selection also plays a key role in determining the building's overall thermal performance. The majority of architectural glazing consists of insulated glass units. The thermal per- formance of the insulating glazing depends mainly on the solar energy transmittance through the glazing, refl ec- tance of the glazing, width of the air space and material and confi guration of the spacer around the perimeter of the unit. This choice protects the building against air and water infi ltration and manages heat gain to create a comfortable indoor environment. One example of a project that used custom-unitized cur- tainwalls with glass and glaz- ing was the expansion of SSM Health St. Joseph Hospital West, located in Lake St. Louis, Missouri. This hospital was estab- lished in 1986 to meet the expanding healthcare needs of western St. Charles County in Missouri. As the Lake St. Louis area grew and residents from surrounding counties Spotlight 4 developing trends of healthcare building envelopes Building Exteriors BY DANIEL SHIELDS SCREEN TIME On this hospital project, both rainscreen cladding systems used aluminum composite material and phenolic panels attached to a custom-designed, thermally isolated sub-girt system. > Left: For healthcare systems, phenolic panels are a great choice because of their durability, weather resistance and low maintenance. 4 d d l ping t r n d f h h a l l t h h ar b b b u i i l l d d i n g n l l p Rx for Enclosures

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