Medical Construction & Design

JUL-AUG 2015

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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Page 28 of 70

Research, innovation and advancements continue to be fundamental to the fi eld of medicine, inherent to providing better care and improving patient outcomes. As a result, medical solutions, techniques and best practices remain in a constant state of evolution. The pursuit of progress is unquestionably vital. The industry must endeavor to hold itself to the same bold principles — designing facilities that ex- ceed the standard in building performance, occupant comfort, safety and sustainability. The design alternatives possible with stone wool insulation give greater options to consider in meeting specifi cations and improving a roof system's overall perfor- mance. Yet, higher published R-values have made foam roofi ng insulation, such as polyisocyanurate, EPS and XPS, a favored choice among designers and specifi ers for years. Although, recent building science research has shown that a reduction in thermal performance is evident as tem- peratures drop. Shrinkage is also evident in foam plastic insulation due to expansion and contraction in fl uctuating environmen- tal conditions. The result is a compromised air barrier, which will degrade the thermal insulating value of the system. In medical construction, insulation R-values and thermal performance are critical. When every dollar possible can be earmarked for improved patient services, better equipment or groundbreaking re- search, fi nding ef ciencies to ensure funds are not funneled away from core needs is paramount. What's more, ensuring optimal patient comfort is an important concern in the recovery process. So, with more at stake, how do medi- cal building designers make certain the R-value specifi ed is the R-value they get? A comprehensive fi eld monitoring study of conventional roofi ng performance, conducted by RDH Building Engineer- ing Ltd., found that incorporating even a single layer of stone wool insulation into a conventional roofi ng assembly improved thermal performance under both hot and cold extreme temperature fl uctuations. building envelopes HYBRID ROOFING = LONG-TERM BENEFITS Incorporating stone wool as part of a hybrid roofi ng system provides a number of distinct advantages from long-term stable R-value, fi re and moisture resistance to sound absorbency, dimensional stability and impact resistance. In this photo, roofi ng membrane is applied to stone wool insulation impregnated with a bitumen layer, which is compatible with torch- or mop-applied membrane. Spotlight BY ANDREW LINDLEY Exceeding healthcare building performance standards with roofi ng options A Hybrid Solution 24 Medical Construction & Design | J U LY/AUGUST 2015 | MCDM AG.COM

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