  ZERO INTERNATIONAL ZERO’s SOUND TRAP sound control systems are solving sound problems in all types of facilities – among them performing arts centers, recording studios, commercial offices, hospitals, schools, churches and apartment buildings, as well as industrial plants.
Adjustable gasketing: key to sound success Nobody does sound control better than ZERO. Our sound seals and systems are built to withstand the stress of the installation process and perform reliably. We use advanced technology to master two critical challenges: creating an effective sound barrier at the perimeter of the door AND preventing gaps in that barrier for the life of the assembly. Gaps in sound barriers are a major problem because sound travels through any opening in a barrier with very little loss. While the amount of air flowing through a gap increases roughly in proportion with the size of the gap, the size of the gap in a sound barrier does not matter. A small hole transmits almost as much sound as a much larger gap. Because of this phenomenon, any unsealed gaps effectively cancel out the noise reduction benefits of even the highest-rated sound doors. To be effective, acoustical door assemblies require gasketing that provides a complete, uninterrupted andair-tight seal around head, jamb and sill. If all sides of the door are not sealed, the gasketing used will provide little or no sound-control value. Imperfect alignment is a common cause of gaps even in newly installed gasketing. Problems can also surface later on as buildings shift and settle and doors cycle through changes in temperature and humidity. ZERO solves the problem efficiently with adjustable gasketing. Models such as the # 770 adjustable jamb-applied gasket are designed to perform consistently over time. When clearances increase, a few turns of a Phillips screwdriver is all it takes to restore a sound-tight seal. (see the CAD drawing on our Sealing Systems product page.) The integrity of the sealing system is essential to its sound rating. ZERO guarantees the performance of SOUND TRAP systems properly installed in rated assemblies, provided that other manufacturers’ gasketing products are not mixed with ZERO components. PROVEN SOLUTIONS FOR SEALING THE GAPS SOUND TRAP gasketing systems satisfy a wide range of common commercial and industrial sound-control applications for single swinging doors, as well as double doors. Many configurations are available to optimize sound control for specific environments.  SOUND TRAP-52 Sealing Systems (Product Code STC 2) Designed for use with sound-rated single metal doors with cased-opening frames, these systems provide an STC 52 rating when properly fitted with STC 55 or higher acoustical doors. That level of sound control means that loud sounds will be heard only faintly, or not at all, on the opposite side of the door, which satisfies the typical needs of recording studios and performance halls. It is also suitable for office buildings and other commercial facilities that need to mute very loud noise originating from outside—such as the sound of aircraft overhead or heavy city traffic nearby—as well as interior equipment noise. A metal frame without a stop is required in order to use the Model #770 adjustable head and jamb seal, which is an important component in this system. The # 770 is recommended for ensuring the highest possible rating for most purposes.
SOUND TRAP-49 Sealing Systems (Product Code STC 6) Featuring several alternative head and jamb seals designed for use with single doors with frame stops, these systems provide a 49 STC value—meaning loud speech will be heard only faintly and cannot be understood on the opposite side of the door. That level of acoustic performance is suitable for a variety of applications ranging from busy schools to multi-family residential buildings.
SOUND TRAP-PAIRS Sealing Systems (Product Code JD6S) Pairs of doors pose additional challenges for sound control because there
are more openings to seal. The need for a meeting stile means there will always
be relatively more sound leakage through pair assemblies than with single doors.
Properly fitted with STC 52 or higher acoustical doors, ZERO’s SOUND TRAP-PAIRS
system for metal doors achieves an office-friendly STC rating of 41 with an optimal
configuration that balances those limitations with appropriate, cost-effective
technology. STC 3003 Sound Barrier Using the right gasketing to block sound leaks around the perimeter is not enough to solve a noise problem if the door itself is not an effective sound barrier. ZERO’s Engineering Department can help evaluate possibilities for enhancing the performance of low-rated doors with the addition of one or two layers of sound-blocking material. Our STC 3003 sound barrier is intumescent material that acts as a thin, dense sound barrier layer and can significantly increase the STC value of the door. It will not reduce any existing fire rating of the door. STC 3003 sound barrier is suitable for layering in the construction of acoustical doors. In some cases, it can be applied as an outer layer to existing doors, provided care is taken in installing over seams. It can also be painted with latex paint. SOUND DOORLITE SYSTEMS: Let the Light In Attractive Slimport circular frames containing a special sound barrier sheet can be used to install vision lites in sound-rated doors. Manufactured in the U.K. by Zero Seal Systems, Ltd., these frames are suitable for installation in walls and partitions, as well as doors. They feature a unique, flush-fitting design with countersunk holes and mounting screws around the bevel on one side only for a clean appearance on the corridor side Slimport frames are available in seven finishes, including stainless steel, zinc-plated paint-ready mild steel, and architectural finishes.
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