When you are building or renovating — laying a new floor, building out a wall, installing a floor screed — you have the opportunity to incorporate mass at the point of construction rather than adding it afterwards. Acoustic membranes are designed for exactly this purpose. Dense, flexible, and fully bondable, they are integrated into the floor or wall build to add mass where it has the greatest effect: within the assembly, rather than applied to the surface after the fact.
The result is a higher-performing separating element that does not require additional surface depth and that is effectively permanent — the membrane becomes part of the building rather than a layer added on top of it.
How acoustic membranes work
Acoustic membranes are high-mass, low-stiffness barrier layers. Like Mass Loaded Vinyl, they block airborne sound by adding density to a building element — sound energy has to work harder to make a denser surface vibrate. The key difference in application is in how they are installed: acoustic membranes are typically bitumen-based or polymer-based products that can be fully bonded to the substrate or to adjacent layers, making them appropriate for use within floor and wall systems where a floating or hung installation is not possible.
They are commonly used beneath floor screeds, within timber joist floor systems (laid over the joists and beneath the floor boarding or deck), and between layers in laminated wall systems.
Installation disruption level: high. Acoustic membranes are construction-phase products — they are appropriate when floors or walls are being opened up, rebuilt, or constructed from scratch. They are not suitable for surface application to finished spaces without significant disruption.
Typical use cases
- Under floor screed in new builds and conversions — acoustic membranes beneath a concrete or anhydrite screed add mass to the floor system, contributing to Part E airborne sound compliance for separating floors
- Within timber joist floors — laid between the joists and the deck (floor boarding or sheet material), membranes increase the mass of a timber floor system that would otherwise be too lightweight for adequate sound separation
- Laminated wall systems — incorporated between double layers of acoustic board in a high-performance party wall system, adding mass in the laminate without increasing overall wall thickness disproportionately
- Wet room and bathroom floors — bitumen-based acoustic membranes can combine acoustic and waterproofing functions in wet-room floor builds
- Conversion projects (loft, barn, commercial-to-residential) — where separating floors are being built from scratch and Part E compliance is required for the building regulations sign-off
Technical notes
Acoustic membrane performance is described by mass per square metre and Rw contribution to the overall system. System-level test data — including the complete floor or wall assembly with membrane — is available on request and should be used in preference to single-product Rw figures for specification purposes. Products are tested under BS EN ISO 140/717. For Part E compliance, the relevant metric is the whole-element Dnt,w + Ctr (or DnT,w); we can advise on assemblies that meet these targets.
What's the difference between acoustic membranes and Mass Loaded Vinyl?
Both are high-mass, flexible barrier layers used to add sound-blocking performance to building elements. The distinctions are in material composition and application method.
Mass Loaded Vinyl (MLV) is a PVC-composite membrane that is limp and flexible enough to be hung as a barrier curtain, nailed to an existing surface, or laid loose beneath a floor. It is the preferred choice for removable or flexible applications — particularly in rented or leasehold properties where a permanent bond is not appropriate.
Acoustic membranes (bitumen-based or other polymer products) are designed to be fully bonded into a construction system. They are less flexible in how they can be applied but more stable and durable in permanent construction contexts — particularly where they need to be incorporated into a wet screed system, bonded to a concrete subfloor, or sandwiched within a laminated build.
Unsure which is right for your project? Tell us about your build and we'll advise on the correct specification.