15 October 2020
Blog
Acoustic design and performance using Trisobuild® systems

The acoustic performance of an envelope roof and wall system is becoming more and more important for building design as its being increasingly relied on to control noise within the building environment or control the escape of noise or impact of noise created externally.

To describe these types of acoustics we have two main types of control and they are sound absorption and sound reduction. The Trisobuild® systems have standard specifications that can be used to provide control for both, or, our Technical Engineers can design bespoke solutions to meet requirements. 

The sound absorption is the measure of how much a product will absorb sound and is measured across the frequency range 50Hz to 5000Hz and is noted as a coefficient where 1.0 is a perfect absorber of sound and 0.0 is a total reflection of the sound. Sound absorption of the Trisobuild® systems is achieved by perforating the RL32 liner with a specified hole pattern that that is either fully perforated or trough perforated, it is the holes that allow the sound to be absorbed and reduce the amount of sound reflection. To assist in the absorption of the sound, dense insulation is used behind the perforations and also as an option insulation can be installed in the troughs of the RL32 profile.

Trisobuild fig 1.jpg

For the sound absorption we have four tested system types SA1, SA1+, SA2 & SA2+. The trough perforated liner is the SA1 type and without the trough infills has a sound absorption Class ‘C’ but when the trough infills are added to make it an SA1+ system it has an improved sound absorption Class ‘B’. Where the fully perforated liner is used SA2 we have test data for a 30mm or 50mm rock fibre layer, the 50mm has a slightly improved lower frequency absorption over the 30mm rock fibre layer but both are Class ‘A’ sound absorption, this result is also mirrored with the SA2+ trough infill option.

Trisobuild fig 2.jpg

For sound reduction this relies on almost the opposite of sound absorption where you don’t want perforations and you want to create a sealed system with good insulation. This type of system relies on the mass of the materials and damping control. The frequency range used for the measurement of buildings and building products such as the Trisobuild® systems is 100Hz to 3150Hz where a weighted curve is used to give us a single figure guide to the system performance and the higher the figure the better the sound reduction.

The acoustic performance of the Trisobuild® constructions detailed below has been predicted using the 2019 version of the computer programme developed by Tata Steel.

Trisobuild fig 3.jpg

Please contact our Technical Department for further details or use our online specification tool to help you create the right specification for the performance that suits the needs of your project. Doing this will give you peace of mind that cladding components are compatible and perform together as a system.

Download our brochure for more information on all our Trisobuild® systems

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