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Treatment Strategy

  • PathDirect

Application Use

  • Industrial In-plant
  • Industrial New Con.
  • Architectural Walls/Ceilings
  • Environmental
  • HVAC


Sound Barrier Walls

Modular Environmental Sound Barrier Walls To Control Community Noise Emissions

Power utility transformer HUSH WALL™ barrier. HUSH WALL™ barrier surrounds condensing units.
Advantages: Applications:
  • Best solution for property line noise ordinance compliance
  • Turnkey design including modular panels, structural steel, flashing, fasteners, doors
  • Designed to meet site wind load requirements as per building codes
  • Engineering services include footer/foundation designs, PE stamped drawings, and wind load calculations
  • Optional polycarbonate construction
  • Installation and erection services available
  • Optional factory or field painting
  • Standard designs utilize 2", 4" and 5" thick HUSH GUARD™ acoustic panels rated at up to STC-48 and NRC 1.15
  • Can incorporate lift-out sections, acoustical ventilation louvers, and other customized features
  • Able to accommodate column spans of up to 16'
  • Utilities and substations
  • Mass transportation
  • Highway barriers
  • Cooling Towers
  • Airports and military bases
  • Race tracks and open recreational areas
  • Industrial, commercial and residential
  • Process fans, blowers and compressors
  • Construction barriers (portable designs available for purchase or rent)
  • Chillers and condensing units
  • Rooftop or grade mounted bldg HVAC equipment
  • Scrubbers, Incinerators, and Thermal Oxidizers
  • Dust collectors and cyclones
  • Material handling, transfer conveyors, and classifiers
  • Industrial/Manufacturing facilities located in residential areas
  • Any outdoor equipment or noise source


About BRD HUSH WALL™ Products:

BRD HUSH WALL™ acoustical barriers are free standing, self-supporting modular composite systems providing both sound blocking (sound transmission loss) and sound reflection control (sound absorption).  Panelized walls tie into a structural steel framework of vertical columns with diagonal, corner, and knee bracing as needed to meet the project requirements for wind loading.  Basic HUSH WALL™ configurations are either external or internal mounting.  Classic internal mounting is illustrated in the details below.  Here the acoustic panels are stacked horizontally inside the web of the vertical column flanges and secured with backer angles.  For the external mounting configuration, panels are usually attached in a vertical orientation to steel angles or channels that span across the vertical columns.  This mounting option is illustrated in the detail below.

Grade-mounted HUSH WALL™ reduces scroll chiller noise to achieve 52 dBA at 5'.


Typical HUSH WALL™ Internal Mounting


Wide flanged beam detail for high wind loads, tall
walls, and post spacing applications



Typical HUSH WALL™ External Mounting


Structural Steel Specifications
  • Wide flange sections per ASTM A992 or A572 Grade 5D
  • Angles/Channels per ASTM A36
  • Hollow structural sections per ASTM A500 Grade B
  • Plate per ASTM A3
  • Design and fabrication to latest AISC standard
  • Welding in accordance with latest ANSI/AWS D1.1
  • Design loads per local building code requirements
  • Shop coated paint primer finish with option for finish paint or hot dip galvanized
  • Sand blasting prep is optional


Grade-Mounted Single Support Footers
The most common method of grade support for HUSH WALL™ vertical columns is individual footers.  The sonotube footer installation procedure is illustrated at left and below.  Circular footers of this nature do have some limitations depending on soild conditions, wind load requirements, exposure, and HUSH WALL™ overall height, size and configuration.  They are also the most economical to install.


Grade-Mounted Continuous Curb Foundations
Anchorage Selection Requirements
The contractor whose scope includes the footers/foundation should select and supply the anchors for the support columns.  Typically for new construction, an "L" or "J" type anchor is recommended and should be positioned during the concrete pour.  For installation on existing concrete, drop-in type epoxy grout fasteners should be used.

Acoustic Performance Data:

Product Sound Transmission Loss (dB) Frequency (Hz) STC
125 250 500 1000 2000 4000
HG-200 17 23 34 47 55 57 37
HG-210 24 25 33 43 50 55 38
HG-400 21 28 39 48 56 58 40
HG-410 23 31 40 49 56 62 42
HG-420 27 34 41 46 53 59 44
HG-500 18 26 35 45 49 52 37

Product Sound Absorption Coefficients Per Frequency (Hz) NRC
125 250 500 1000 2000 4000
HG-200 0.15 0.66 1.07 1.06 0.97 0.86 0.95
HG-210 0.26 0.53 1.00 1.03 0.97 1.02 0.90
HG-400 0.60 1.13 1.12 1.09 1.03 0.91 1.00
HG-410 0.68 1.06 1.12 1.08 1.03 0.98 1.05
HG-420 0.45 0.96 1.15 1.10 1.05 0.97 1.05
HG-500 0.92 1.15 1.22 1.13 1.08 1.04 1.15

Panel Constructions:

Panel Thick-ness Solid Skin Perf. Skin Weight per sq. ft.
  1. Panel skins are all galvanized cold rolled steel.
  2. Perf. skins have 3/32" holes on 3/16" staggered centers
  3. Optional aluminum and high density polyethylene constructions
  4. All stiffeners and panel channel framing is minimum 18 ga. steel with face sheets spot welded in place.
  5. Panels are designed to withstand wind loads of 25 to 40 lbs/sq. ft. both negative and positive
  6. Panel fill is non-combustible high density semi-rigid non-hygroscopic HUSH BATT™ packed under 5% compression.
HG-200 2" 18 ga. 22 ga. 4.0 lbs.
HG-210 2" 16 ga. 22 ga. 4.7 lbs.
HG-400 4" 18 ga. 22 ga. 5.0 lbs.
HG-410 4" 16 ga. 22 ga. 5.7 lbs.
HG-420 4" 16 ga. 22 ga. 9.6 lbs.
HG-500 5" 16 ga. 22 ga. 6.0 lbs.


Panel Finishes: Steel Finishes:
  1. Galvanized steel (standard)
  2. Galvanneal "Paint Ready" A-60 steel (optional)
  3. Air dried shop applied
  4. Thermosetting TGIC Polyester Powder Coating in color selected by Architect
  5. Custom as specified
  1. Prime Painted (standard)
  2. Primer with air dried shop applied finish paint
  3. Hot dip galvanized (availability dependent on final steel member sizing)
  4. Colors available to match panels
  5. Sand blasting prep only as specified by contractor
  6. Custom as specified


Traditional Internal Mounting Panel
Stacking Options With Fasteners

Tongue & Groove HUSH WALL™ Sound Barrier reduces emergency generator noise. Partially erected 30' high HUSH WALL™ encloses multi-stage compressor at air separation plant.
Tongue and Groove
Panel Connection
"H" Joiner Panel


Self Sealing Panel Stacking Options



  • Does not require fasteners for panel joining
  • Clean aesthetic appearance
  • Reduces installation labor costs
  • Best suited for horizontal internal mounting
  • Increases panel rigidity and strength to allow long panel spans between columns
  • Self-sealing and self-draining
  • Best architectural solution


Self Sealing Panel Stacking Options (cont'd)



TO 16' LONG!


Customized HUSH WALL™ Solutions
Shed roof HUSH WALL™ design protects upper floor building occupants. HUSH WALL™ sound barrier constructed using HUSH CRETE™ acoustical CMU.
HUSH WALL™ with top mounted sound baffles quiets chiller condenser fan exhaust. Integrated HUSH DUCT™ acoustical louvers allow HUSH WALL™ systems to "breathe"
HUSH WALL™ equipment mounted sound barrier Unitary™ System. Optional HUSH CLAD™ absorption panels reduce buidling reflected noise.


HUSH WALL™ Remedial/Retrofit Designs
Side Mounted Cantilevered Framing
Top Mounted Cantilvered Framing
Bottom Mounted Cantilevered Framing


Rooftop Mounted Support Options


Advanced planning during the design phase of new construction projects allows the equipment support structure to be oversized to provide adequate operational and maintenance clearance around the equipment in accordance with the unit OEM guidelines.  This is particularly important for rooftop HVAC units such as condensing units, cooling towers, and chillers where proper airflow to the equipment is essential to maintain efficiencies and to avoid derating of the performance.  HUSH WALL™ sound barrier heights need to be increased as the panels move further away from the noise source.


Where it is advantageous or necessary to distribute the static (dead load) and/or dynamic (overturning moment from wind loading) forces transmitted to the building steel, the post and rail design may be preferred.  This results in a greater number of roof penetration, especially where diagonal knee bracing is necessary.  When combined with an external mounted system, panel installation will be simplified and it is easy to bring the panel wall base elevation down close to the roof for a more uniform look and improved acoustics on critical applications.


HUSH WALL™ Temporary/Construction
Sound Barrier Systems
Close-up of the outrigger system to stabilize temporary HUSH WALLS™ 20' high HUSH WALL™ temporary sound barrier for power generator rental equipment


  • Grade beams require no footers or foundation work
  • Available up to 20' high
  • Outriggers to stabilize vertical columns supporting the panels
  • Rated at STC-40 and NRC .05
  • Standard finishes are galvanized steel for panels and prime painted mild steel for structural
  • Optional powder coat or other surface finishes
  • Single or multiple wall configurations are available


  • Highway/road construction
  • Soil remediation projects
  • Power rental equipment
  • HVAC/Refrigeration rental equipment
  • Events and recreation