How Noise Barriers Work

The "nuisance" noise is "diffracted" over barriers increasing the distance it must travel to the listener.

Z =A+B-C Z (Metres) Potential Noise Decrease Due to Diffraction 1 15dB(A) 2 18dB(A) The values above are approximate and do not represent a linear relationship

Reflection & Absorption

The effectiveness of a barrier depends on how well it diffracts and absorbs the noise. A high performance barrier has negligible noise transmission and reflection. This is controlled by two coefficients: Absorption() and Sound Insulation (R).

Quality Noise Barriers

• significantly reduce the noise levels.
• guarantee acoustic performance.
• significantly reduce public complaint levels.
• provide an aesthetic visual barrier that will last.

Two Types of  Noise Barriers

Absorptive Barriers:	Reflective Barriers:
Absorb the noise that strikes them (Reflections are negligible) For High Performance   Sound Absorption Coefficient > 8dB(A) (negligible noise reflected)   Sound Insulation Coefficient > 25dB(A) (negligible noise transmitted)	Redirect the noise that strikes them. (They do not "reduce" the noise) For High Performance   Sound Insulation Coefficient > 25dB(A) (negligible noise transmitted) Reflections must be accounted for. (as shown below)

 

 

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Curtain Enclosures - Acoustical Pipe and Duct Lagging - Sanitary Panels and Baffles - Portable Screens - Damping Compound - Industrial Ceiling Baffles - Class 1 Fire Rated Foams - Polyurethane Foams - Fiber-Free - Adhesive Backed - Facings and Barriers - SONEX - Sound Seal - Acousti Curtain - Acousti Foam

Acoustical Baffles & Diffusers  – Built of absorptive or active materials these items can be suspended from ceilings or attached to walls to absorb or reflect noise. They are commonly available for industrial, commercial, and or recording, web/broadcasting applications.

 

Interior and Theatrical Applications  – Acoustical panels addressing problems in theatres, auditoriums, rehearsal studios, conference rooms, office areas, etc. are available in all forms, shapes and colors. Various panel types may be covered in fabric, plastic, steel, aluminum, or painted. Depending on where and how they are to be used will dictate the best surface material.

While panels absorb sound, diffusers are used to regulate sound to optimum levels with angled surfaces. Reflector panels can be used in ceiling systems to actually carry sounds properly into large performing areas.

Vinyl / Barrier, Foams & Composite Materials  –  Mass-loaded vinyl may be used for blocking sound from leaving or entering an area. Flat foams, as well as pyramidal foams, can be used in rooms or machinery requiring sound absorption. Because most noise problems require a combination of materials, we sell them in various composites. For instance, it is often required to have a layer of sound barrier material, adhered to a sound absorbing material. Instead of simply increasing the mass of a barrier to obtain greater sound barrier properties, a lighter construction can be achieved by separating the barrier from the wall or panel with a de-coupler or spacer, of light material, such as flexible foam. Composite materials may be used in machinery cabinets to reduce noise, around pipes for expansion and contraction noise (pipe duct lagging), etc.

(When choosing a barrier, some properties which should be taken into consideration are: thickness, density, stiffness, resistance to heat and chemicals, flammability, tear strength, abrasion resistance, thermal insulation, flexibility and cost.)

We offer a tremendous variety of composite materials. Some of these products are treated with heat resistant coatings to withstand up to 500 degrees! 

With more information about your unique problem, we can appropriately recommend the exact material needed to properly address your situation. We look forward to being able to assist you!

 

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