AKUSTIK LATERAL + SYLOMER HANGERS IN CLT CONSTRUCTION WITH A FLOATING SCREED WITH HEATING SYSTEM

11/18/2025

This article details the results of tests on a suspended ceiling and a floating screed with a heating system in a CLT construction. The objective of these tests has been to determine the improvement in acoustic performance.

Introduction

Cross-laminated timber (CLT) structures are made of layers of wooden boards glued together. The boards in each layer are oriented perpendicular to the adjacent layers, giving the structure similar properties in both directions.

Generally, wooden structures are more difficult to acoustically insulate due to their lower mass compared to concrete structures. For this reason, the appropriate selection of acoustic insulation products becomes more critical.

The Tested Product

AKUSTIK LATERAL + SYLOMER®

Akustik Lateral + Sylomer® acoustic hangers are designed for the suspension of acoustic false ceilings, vibrating pipes, and machines that need to be suspended. The exceptional properties of the microcellular polyurethane Sylomer® achieve excellent insulation values compared to other substrates using rubber or cork or a combination of both.

These anti-vibration mounts are made in three special Sylomer® blends to better suit the load of each application. A wide variety of fastening elements facilitate their installation and adapt better to each type of work. Their robust metal parts withstand tensile loads of 650 to 1000 Kg and are provided with an anti-corrosion treatment capable of withstanding the most demanding environments.

The natural frequency at its optimal load point can reach values below 8 Hz. These technical properties also offer a high level of acoustic and vibrational isolation when used in lightweight wooden structures.

Test Results

To demonstrate the acoustic advantages of using Akustik Lateral + Sylomer® hangers, impact noise and airborne noise tests were conducted on a cross-laminated timber structure. The acoustic test results for each configuration are presented below:

System A

Scheme		Description
		CLT 120mm
Impact Noise Results – Ln (dB) according to ISO 10140-3:2021		Airborne Noise Results – R (dB) according to ISO 10140-2:2021

Ln,w: 88 dB	IIC: 22	Rw: 35 dB	STC: 35
Go to Impact Noise Results Report Ln (PDF)		Go to Airborne Noise Results Report R (PDF)

System B

Scheme		Description
Natural frequency: 9,3Hz		Cement mortar reinforced with electrowelded mesh - 60mm Closed-cell polyethylene foam with heat-sealed overhang film – Madiplinthe - 8mm Cross-linked polyethylene film in red color and coated with an outer layer of EVOH - Pipex - 1.5mm and Colorless polyethylene film - 0.2mm Rock wool - Domisol LR30 - 30mm CLT 120mm Akustik Lateral + Sylomer 15 TYPE B supports Profile S47 - Prégymétal - 0.6mm Rock wool - PMNU 40 - 80mm 2 BA13 plasterboards - Pregyplac STD BA13 SINIAT - 12.5mm X 2
Impact Noise Results – Ln (dB) according to ISO 10140-3:2021		Airborne Noise Results – R (dB) according to ISO 10140-2:2021

Ln,w: 48 dB	IIC: 62	Rw: 72 dB	STC: 70
Go to Impact Noise Results Report Ln (PDF)		Go to Airborne Noise Results Report R (PDF)

System C

Scheme		Description
Natural frequency: 9,3Hz		CLT 120mm Akustik Lateral + Sylomer 15 TYPE B supports Profile S47 - Prégymétal - 0.6mm Rock wool - PMNU 40 - 80mm 2 BA13 plasterboards - Pregyplac STD BA13 SINIAT - 12.5mm X 2
Impact Noise Results – Ln (dB) according to ISO 10140-3:2021		Airborne Noise Results – R (dB) according to ISO 10140-2:2021

Ln,w: 59 dB	IIC: 51	Rw: 62 dB	STC: 63
Go to Impact Noise Results Report Ln (PDF)		Go to Airborne Noise Results Report R (PDF)