BlastBlock

What is mass loaded vinyl, and when is it the right answer?

How MLV works as an acoustic barrier, where it outperforms adding another layer of board, and where it is the wrong product entirely.

Mass is the mechanism

Sound transmission through a partition is governed largely by mass. Double the mass of a single-leaf partition and you gain roughly 5 to 6 dB of transmission loss. That is the mass law, and it is why heavy walls are quiet walls.

The practical problem is that mass takes space. In a hotel refurbishment or a condominium fit-out you rarely have 100 mm to give away. Mass loaded vinyl solves the space problem by delivering a high surface density in a membrane a few millimetres thick.

Where MLV earns its place

MLV is most valuable where the build-up depth is fixed and the acoustic target is not being met: existing partitions being upgraded, floor build-ups under a finished level, ductwork and pipe lagging, and machine enclosures.

It is also the pragmatic answer in refurbishment, where demolishing and rebuilding a partition is not an option but the guest complaints are real.

Where MLV is the wrong product

MLV is a barrier, not an absorber. If the complaint is reverberation inside a room — a restaurant that is too loud, a meeting room with a harsh ring — MLV will do nothing. That problem needs porous absorption, and specifying a barrier there wastes the client's money.

MLV also cannot fix flanking. If sound is travelling around the partition through a continuous ceiling void, a shared floor slab, or a poorly sealed service penetration, adding mass to the wall leaf changes very little. Find the flanking path first.

Installation determines the result

A barrier is only as good as its seal. Overlap and seal all joints, seal the perimeter, and treat every penetration — a single unsealed socket box can undo a layer's worth of performance. Putty pads and acoustic sealant are not optional extras on a barrier installation.

Decoupling matters too. MLV fixed rigidly to both leaves of a partition creates a bridge; where the design intent is a decoupled build-up, keep it decoupled.

Products referenced

• BB830 — The flagship acoustic optimized MLV barrier for walls, ceilings and floors where added mass has to fit in a shallow build-up. Aluminium faced, with the facing to the noise source, where it also acts as a vapour barrier.
• BB830FR — The BB830 barrier in a fire-retardant formulation, for projects where the acoustic layer has to satisfy fire requirements as well as an STC target — with no loss of acoustic performance.
• BB830LF — The heavy low-frequency sheet, tuned for bass energy — plant rooms, studios, cinemas and any partition where low-frequency transmission rather than speech is the complaint.
• BB460 — Combined sound blocking and vibration damping, used where structure-borne energy matters as much as airborne — automotive, marine and industrial.

Supply in Southeast Asia

BlastBlock supplies the full range across Thailand, Malaysia, Indonesia, Vietnam, Philippines, Singapore. Distribution enquiries: info@blast-block.com.

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