Eight Oklahoma county courthouses were replaced with Rehau’s uPVC window models.
if they did, they’d know it’s not as ing to provide required sound atten- populations continue to condense in
much as they think it is. It’s a lack of uation.” He adds that STC is a value metropolitan areas, more people will
intended for interior sounds passing be seeking solutions for sound reduc-
Schimmelpenningh says the mis- through a partition, whereas OITC is tion. She, too, references New York as
understanding of the interlayer’s cost a reﬂection of the noise outside of a a prime example. “With more people
versus added value is one of the big- building.
moving into the city,they’ll take a small
gest differences between the European For Schimmelpenningh, it’s a lack of parking lot between buildings, and
and U.S. markets. Since the use of lam- understanding as to what these num- build a tall building there just to ﬁt it in.
inated glass is more widespread in Eu- bers actually mean and how they relate With buildings in such close proximity,
rope, the price for adding an acoustical to acoustical glazing’s performance. it’s going to raise the issue of noise.”
interlayer doesn’t seem as drastic com- “Numbers don’t play into perfor-
pared to that of the U.S. mance,” she explains.“They’re a tough a key driver in product awareness for
Here, laminated adoption is usually thing to describe to someone. When architectural applications, is the use of
Second, which she believes will be
for impact resistance. We have many you see an STC number of 35,you likely laminated glass in vehicles.“People are
more people looking at the product don’t know what it means, and looking demanding acoustically quiet cars. I’m
thinking, ‘It’s so expensive,’” she ex- at 32 to 35, it doesn’t seem much dif- in my car at least one to two hours a
plains, noting that the price-per-inch ferent. But it could mean a tremendous day, and once people realize they can
increase from regular glass to lami- amount of change.”
nated is about 20 percent.“It’s not as big
have that same performance inside of
their workplace, that’s when awareness
is really going to change.”
of a price change as people think it is.” Awareness Could
Hull says when consumers under- Drive Demand
Schimmelpenningh says in order to
Architects and other speciﬁers are really increase awareness, the industry
stand that acoustical glazing contrib-
utes to a higher level of performance, paying more attention to sound atten- has to get people asking for its per-
they often realize it’s worth paying for. uation, as Hull points out, but since formance since it’s an unseen feature.
Schimmelpenningh notes, “You’re noise codes don’t require a speciﬁc From there, the architectural com-
not just getting acoustics—you’re glazing performance, the addition of munity may be more inclined to use
getting safety, security, hurricane re- an acoustical interlayer isn’t often a acoustical glazing from the beginning
sistance and solar performance. It’s priority.
inherent in the product … you get ev- “The regulations are focused on lim-
of a project.
“You don’t know when you’re putting
erything with it, and that’s a big thing.” its to the noise sources themselves,” he in a building who’s going to be building
says.“For instance, music coming from around you, or how the environment is
It’s in the Numbers
vending carts, construction noise and going to change around you,” she says.
Aside from cost, these experts say other outside noise may be limited to “ … Think ahead and put [acoustical
there’s still a lot of confusion when it certain hours of the day, rather than the glazing] in at the beginning instead of
comes to acoustical glazing and its per- windows themselves requiring a spe- trying to rectify it afterwards. It’s more
formance,such as Sound Transmission ciﬁc OITC.A building code requirement expensive after the building’s built and
Class (STC) and Outside-Inside Trans- would go a long way in advancing the the occupants are in there.” n
mission Class numbers.
use of acoustical glazing in urban
Architects frequently ask for STC areas and speciﬁc occupancies.”
Schimmelpenningh agrees, but
mission loss performance across the adds that she foresees a couple of
entire frequency spectrum,” Hull says. additional factors that could poten-
It’s important to identify the key fre- tially cause the market to take off.
quencies that will be affected in order First, she notes that it’s a de-
numbers, but don’t review the trans-
K a t h e r i n e C o i g is the
assistant editor of USGlass
magazine. She may be
reached at firstname.lastname@example.org.
to understand the ability of the glaz- mand driven by need. So, as
June 2017 | USGlass, Metal & Glazing