Cultuurcentrum Leietheater

The Leietheater, Deinze's new cultural centre, opens its doors to the public in September. The new building is designed by the young architect duo V+ & Trans and houses a 450 seat theatre, offices, multifunctional spaces and a cafeteria.

The building is a compact volume with a ground floor in glass and aluminium and a superstructure in white glazed brick. The eye-catcher of the building will be the stage tower rising out above the theatre.

The new cultural centre is located on the corner of the busy Brielstraat and the N35/Tweebruggenlaan, which is why it was feared that there would be noise nuisance inside the building.

By means of the innovative CDM-FACADE-FIX system, a part of the façade of the Leietheater was disconnected from the rest of the structure, a first in Belgium. This way, the transmission of sound from passing traffic is reduced, guaranteeing peace and quiet in the auditorium.

The decoupling is based on the CDM-FIX principle using various rubber components in order to obtain a reduction of the "mass spring-mass" system at approximately 20 Hz.

Cultuurcentrum Leietheater
Cultuurcentrum Leietheater
Cultuurcentrum Leietheater

Bouygues Immobilier

We had to use all our know-how to tackle the challenge that Bouygues Immobilier had set out for us, namely ensuring that the six residental buildings located near the RER C train tracks don’t feel the vibrations.

Beyond the number of buildings the real challenge was to meet the different vibration isolation objectives:


  • On the one hand, offer a solution with a cutoff frequency of 4 Hz: 13,000 tons for 2 buildings supported by CDM-CHR springs.
  • For the other 4 buildings, cutoff vibration at 10 Hz: 15,000 tons supported by CDM-VHS and CDM-SEB elastomer brearings.




Basic-Fit Amiens

Aware that poor acoustics are often a problem in fitness rooms, Basic-Fit Amiens decided to install a CDM-GYM impact resilient floating floor to absorb the vibrations caused by dumbbells being dropped on the floor. 

Together with the acoustic consultant, CDM Group has used its know-how and expertise to find an effective solution while saving their customer money. with more than 25 years of experience in the field of floating floors, the dedicated team installed a new floor using CDM products such as CDM-GYM-LATM50.

Harsh sounds and vibrations are blocked from traveling through the building structure, causing nuisance to neighbours and guests.


Basic-Fit Aubervilliers

Acoustic problems in fitness rooms are reputed to be the most complex to solve given the number of parameters that come into play. Nature and thickness of the support floor, location of the club in relation to residential properties, type of building, and so on are all crucial elements to consider. 

As the Basic-Fit gym in Aubervilliers is located on the ground floor of a 6-storey residential building, residents at all levels complained just after its opening about the vibration nuisances caused by heavy dumbbells and other weights being dropped on the floor and the noise caused by large exercise equipment such as rowing machines.

After an initial acoustical treatment proved to be unsuccessful, the owner hired a second acoustic consultant who submitted several proposals with different acoustic floor suppliers, including CDM. After a thorough study and on site testing, the results obtained on the CDM test platform proved to be the most conclusive.

CDM therefore proposed a different solution with CDM-XP-GYAMPCT 45 dBooster for the ‘free and functional weight’ zone and CDM-GYM-HP for the so called ‘force’ zone in the gym.

Even if it is not the parameter that prevails first, both systems have a resonance frequency of 9Hz.

The CDM-XP-GYMACT45 dBooster system has the particularity of pushing the limits of dry acoustic screeds by seeking out very low frequency (31H) noise, even if the regulation is limited to 125Hz.

In order to avoid any misuse, CDM proposed to install the floor, following tests carried out with dumbbells being dropped on the floor from approximately 1 m, generating noise levels up to 55 dB(A) in Leq, or deadlifts from 80 kg producing more than 42 dB(A) in the apartment above the gym.

We have succeeded in reducing the noise by 30 dB(A) overall, to get to:
- An overall emergence of 1 dB(A)
- A 31.5 Hz of 6 dB max
- At 63 Hz of 8 dB max
- At 125 Hz of 4 dB max


1BEAT is a boot camp gym located on the ground floor of the One Central Building in Dubai Financial District.

Although the type of weights used are relatively light, there was a concern for the transfer of structure-borne noise to the above office spaces.

Due to a restriction in buildup and budget, the system adopted was the CDM-GYM 70. The solution was finished with a 15 mm rubber flooring.

Comparing the LAmax noise level magnitudes from the impact test in the receiver location in the office space directly above, there was an improvement of approximately 22 dB. This improvement was sufficient given the type of gym application.

Installation Detail

End result

Howard Street

A new Premier Inn is being built in the heart of Glasgow in between St Enoch Square and the Clyde.

The building is located directly adjacent to an underground train line which runs underneath Dixon Street. The Acoustic Consultants specified that the portion of the building next to the railway needed to be installed on 3.5Hz springs. The part of the building further from the building could be on 10Hz elastomer bearings

CDM-CHR-BOX pre-compressed spring bearings were used near the railway with a pre-compression that matched the deflection of the elastomer bearings.

10Hz CDM-VHS-FS ealstomer bearings with integrated failsafes were used for the part of the building further from the railway.

CDM designed steel plates and tension caps to cope with disproportionate collapse and also shear keys to restrict movement on bearings located on braced bays.

Columns required no setting out

CDM-VHS-FS bearings installed with plate and tension caps

EuropaCorp La Joliette

Located a stone’s throw from the Tour La Marseillaise, the 12,000 m² complex of EuropaCorp La Joliette will include 14 cinemas. The first screenings at the EuropaCorp La Joliette cinema should begin in December 2018.

Marseille needed a new cinema that would offer comfort to spectators and would be equipped with the latest technological innovations. For this €25 million project, GSE has chosen CDM to supply acoustic floating floors for the isolation of cinemas.

According to the recommendations of the acoustic consultant Acoustique et Conseil, anti-vibration supports intended for the construction of floating floors in cinemas 3/ 4/ 9 and 10 had to meet a resonance frequency of less than 8 Hz. In order to meet this objective, CDM chose the CDM-FLOAT solution for the treatment of the 4 rooms, with the resilient supports glued on the underside of the MDF panels. This system supports a 10cm concrete slab and leave an air gap of 40mm after deflection of the pads.

Installation of CDM-FLOAT panels

Detail of CDM-FLOAT installation

BAM Karaoke

Inspired by the concept of the Asian-born karaoke box, BAM Karaoke Box reinvents karaoke and creates a truly liberating experience.

With this new entertainment, it is essential to offer users a comfortable environment to have a good time, for this reason, good sound insulation is essential.

The company JOSSO CONCEPT, in charge of the project, requested the services of CDM to provide a jackable floating floor system. CDM proposed the CDM-MONT system with springs for the isolation of the 7 rooms, all with different dimensions. The resonance frequency of the isolation system could not exceed 6Hz.

After the pouring and drying of the concrete floating slab, the CDM-MONT boxes incorporated in the floating slab allow to lift the slab and a 50 mm void is obtained to meet the isolation requirement.

CDM-MONT box with reinforcement grid

Jacking of the CDM-MONT boxes

Oude Dokken School

In the Oude Dokken, along the Schipperskaai, SO Gent is responsible for the realisation of a new city building with a day-care centre, an extracurricular day-care centre, a primary school and a community sports hall. The building was designed by Xaveer De Geyter Architects (XDGA).

The sports hall is located on the third floor and is almost 900 m², and is intended for various sports activities. To protect the spaces underneath from noise pollution during sports, the acoustics consultancy prescribed a high-performance floor system based on discrete rubber pads in combination with a high air cavity.

Because the subfloor is not flat but consists of several height levels, and also because of the very large number of pipes running over that subfloor, it was decided to apply a system with maximum flexibility, namely the CDM-LAT floor system. In this system, the sound-absorbing pads can still be moved easily or even rotated if necessary. On top of these CDM-LAT battens, wooden battens were installed with various heights to compensate for the different height levels of the subfloor and thus achieve a flat formwork floor. In this way, cavity heights of at least 170 mm and up to 270 mm were achieved, in which, among other things, large drainage pipes could also be incorporated. The cavity was filled with 100 mm mineral wool to avoid a sound box effect, and the floating floor consists of 120 mm reinforced concrete. In this way, a highly efficient “mass-spring-mass” system is created with maximum sound insulation both for impact and airborne noise.

Sud Lisboa Restaurant

Azinor Group is a multinational hospitality company, established in Lisbon, with brand hotels and restaurants worldwide. As result of the long term partnership existing between CDM and the Azinor Group, a special CDM-POOL systems was developed for Sud Lisboa Restaurant. Sud Lisboa Restaurant is the new exclusive restaurant and event space, from Azinor Group, situated in the Tagus river side walk in Lisbon, next to the MAAT museum.

A rooftop swimming pool was built over a CDM-POOL system specially designed for low frequency noise isolation, generated by pool activities.

This design makes possible the pool activities in the toproof level, with its splendorous view over the river side,