Page 13 - New Jersey Cooperator January 2019
P. 13

of developers on less high-end projects   won’t put the expensive materials in.”   Consequently, “there’s a poor quality of   sound control.”  White agrees. “We see how fast devel-  opers are putting up new buildings, and   with soundproofing it’s about quality, not   quantity,” he says. “We see cheap materi-  als that aren’t installed correctly in new   units, and sometimes they don’t do any-  thing to decouple the floors, which is bad   for impact transmission.”  The proliferation of glass buildings   over the past two decades has made the   problem even more acute. Glass does not   act as a sound reduction agent in any   way. Many new buildings are constructed   with shared walls between units, as well   as between units and common areas,   which adds to the likelihood of airborne   sound infiltration, as well as structural   transmission.  Solutions  So back to the cup and the string. Dr.   Bonnie Schnitta, President and  Owner   of SoundSense, an acoustical consulting   and engineering company with offices   in Long Island and New York City, says:   “If we’re talking about a wall, a floor, or   a ceiling, there are certain things that   improve  or  are  successful  in  inhibiting   sound.  The criteria are that it has to be   dense, must have some level of flexibility   or resiliency to it, and has to have a com-  plete seal. You can have the best wall in   the world, but if it’s got a hole in it, it’s not   going to work.”  The culprits when it comes to sound   transmission between apartments are   often single studs and back-to-back elec-  trical outlets,  which  do little to  reduce   or interrupt the flow of unwanted noise.   Though strongly cautioned against by   architects, developers will often ignore   these pitfalls for the sake of saving a bit   on construction costs.   Marsh adds that “some soundproofing   materials are used within the initial con-  struction, and some installed after. The   easy ones are after construction – things   like carpeting and curtains. Resilient un-  derlayment is used in floor construction   to reduce sound conduction. It might be   foam or fiber. It could also be roof felting,   cork or rubber.”  Bedrock for soundproofing between   floors  is  a  9-inch-thick  poured  con-  crete floor. Anything else, according to   Gaynor, will not prevent sound – partic-  ularly structural sound – from transfer-  ring from one floor to another. Schnitta   agrees, but cautions that “a thick poured   concrete floor itself is great for stopping   sound,  but  if  it’s  not  thick  enough,  it   will be terrible for footfall,” or anything   else with an impact on the floor, such   as dropped articles. She explains that in   New York there is a required ‘IIC,’ or Im-  pact Insulation Class. “Many old build-  ings were not subject to this requirement.   The requirement to cover 80 percent of   your floor with carpet was enacted to ac-  count for this, but if it’s not the right car-  pet or padding, it won’t solve the prob-  lem. There is a special carpet pad called   Vibramat that is very effective for this. It   raises IIC by 20 percent.”  Schnitta explains there are many other   sound-stopping options today. In new   buildings, she recommends loaded vinyl   as a means to reduce sound transference   through studs.  “It’s impregnated with   non-toxic metals, and it’s dense to add   flexibility,”  she  says.  “This  doesn’t  con-  tain lead—remember lead walls!—which   NJCOOPERATOR.COM  THE NEW JERSEY COOPERATOR —  JANUARY 2019    13  continued on page 17  ISTOCKPHOTO.COM  • Design & Specs  • Roofing  • Siding  • Drainage  • Drone Inspection  • Roadways  • Reserve Studies  • Transition Studies  • And more...  Putting the Pieces Together  Our holistic approach to all projects,  large or small, will complete your puzzle!  Call today to discuss how Kipcon can take your  project from inception and design through  construction and successful completion.  Engineering Means  800.828.4118    •  5 Penn Plaza • 23rd Floor • New York • NY 10001

   11   12   13   14   15