VB-4
Flexible Sound Barrier

VB-4 is a composite product that has been engineered to block and reflect high energy, sound energy across a wide frequency range. VB-4 consists of a closed cell neoprene foam layer that is bonded to a dense 1lb ft² vinyl barrier.

How does VB-4 work?
The neoprene foam layer creates an "airsping" that floats or decouples the dense layer of vinyl. It is this airspring that allows for the reflection of high energy soundwaves and prevents the sound energy from passing through the dense layer. The foam layer does not absorb sound nor does it "filter" because it is far too thin to absorb high energy, low frequency sound waves. Be wary of any company that promotes a barrier material in this way.

Where do I use VB-4?
VB-4 may be used on floor and wall surfaces to impede the passage of sound into cabin or stateroom spaces. VB-4 may also be used to block noise that emanates from generator housings or the engine bay.

Why should I use a floating barrier and not multiple layers of a vibration damper?
A common misconception is that vibration damping sheets are designed to block airborne sound energy. Although this technique can yield a reduction in the overall noise floor, it requires 4-6 layers of material which will increase the cost, installation time and dramatically increases the amount of weight added to the vehicle. Save yourself a lot of time, money and hassle by using a dedicated "floating" barrier material first.

VB-4 weighs 1lb ft² and is equivalent to 6 layers of a vibration damping sheet.