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,

Berckelbosch 5D

In Eindhoven, the new Berckelbosch district is being developed with a total of 660 homes, including a number of iQwoningen. Ballast-Nedam’s innovative housing concept is a modular system. The modules are prefabricated to the bathroom tile and the sockets and are transported to the construction site. Within one day a complete house will be built on location.

Plan 5D concerns the 21 quay houses on the south side of the area. The DAF Trucks factory site is located on the other side of the Eindhoven canal. LBP|SIGHT conducted a vibration study and came to the conclusion that measures are needed for these 21 houses to prevent vibration and impact noise: the houses should be placed on vibration dampers with a low resonance frequency of 3-4 Hz.

CDM and Delta-L designed and delivered the solution in close collabration with the construction team. Steel springs are required for the ow resanance frequency of 3-4 Hz. A prestressed solution was chosen in order to limit the deflection on the construction site: CDM-CHR-BOX. The CDM-CHR-BOX is a steel box with prestress bolts and steel springs.

On each pile head a CDM-CHR-BOX has been placed. The foundation beams are supported by the vibration isolators and the houses are placed on the foundation beams. To ensure that no vibrations via the soil end up in the decoupled foundation beams and the facades of the houses, the soil is decoupled using soft rubber granulate mats in a CDM-RAFT solution.

Nautique Living

Nautique Living is a modern student complex with 403 brand new independent student rooms with private bathroom and kitchen. The complex also includes a number of common areas such as a lounge, laundry and private dining room. A sports field has been realised on the roof of the complex.

To prevent nuisance in the rooms - when using the sports field (jumping, ball sports, etc.) - a floating floor construction has been developed on the roof floor. On the roof floor a number of concrete blocks are installed on which a steel construction is laid. On this steel construction, a steel slab concrete floor is poured. Between the concrete blocks and the steel construction vibration isolators are installed with a sufficiently low resonance frequency of approx. 10 Hz.

Because the steel structure had to be anchored with a bolted connection, the CDM-FIX system was used, which is composed of a number of high-quality natural rubber elements (type CDM-81 and CDM-83) and elastic washers around the bolt which ensure that no acoustic bridges are created via the bolts (CDM-FIX). By installing this solution, the connection is completely disconnected and high impact sound insulation is achieved.

PCC Hanzehogeschool

In order to bring all the study programmes of the Prince Claus Conservatoire Groningen together in one building and to create more study space, a design was made for an earthquake-resistant new building and renovated part on the Veemarktstraat in Groningen. On the corner of the building, the conservatory will have its own Jazz Club and the new chamber music hall will also have a prominent place in the facade. Both halls are clearly visible from the outside to stimulate interaction between the music students and the environment.

For optimal sound insulation between the music halls and to other rooms, box-in-box constructions have been designed and realised in the Jazzclub, the ensemble room, the concert hall, the studio, the direction room and the classroom. The box-in-box constructions consist of a heavy concrete floor on vibration isolators in combination with a steel construction for the walls and ceilings. The walls and ceilings of the inner box therefore do not make contact with the main supporting structure. The weight is transferred to the perimeter of the floating concrete floor.

The floating floors are realized with a prefabricated sprung floor system with high quality natural rubber supports (CDM-FLOAT) of 60 mm high with a resonance frequency of approx. 7 Hz. This low resonance rate ensures excellent impact sound insulation. The air cavity - which also plays a role in the acoustic performance of the system - has been increased for even better acoustic performance. Under the edges of the floor, additional natural rubber supports have been placed for the weight of the walls and ceiling.

After installation of our CDM-FLOAT floors, control measurements were carried out on the sound insulation with a very positive result.

Smart Byty

SMART Byty apartment buildings are situated very close to Nové Butovice metro station and just a few metres from the tunnels in Prague. The roughly 300 apartments are equipped with energy-efficient intelligent technologies.

The tunnels next to the buildings posed a challenge for the designers to meet the strict noise level criteria. The acoustic study concluded that in order to remain below the limit in the apartments, the two buildings closer to the tunnel should be constructed on a 11 Hz system, while the other two buildings further from the tunnel require a system with a resonance frequency of 15 Hz.

Based on the vibration isolation study, CDM offered the CDM-SEB system for the project, with 50 mm and 30 mm high bearings. The vibration cut was located at Level -2, on top of the walls and columns, just below the floor slab of Level -1.

After the installation, the building received all the permits and the residents are enjoying, since their move, the quick access to the metro without being disturbed by it.


Vrijzinnig huis

The conversion of the Hauwerstraat’s old police station, on Bruges’ Beursplein, into the “Vrijzinnig Huis” [Humanism Centre], is bringing new life to this neighbourhood. At the same time, this conversion is getting the ball rolling for a neighbourhood-wide upgrade. It will also function as a student recreation centre with a multifunctional room where student associations can get together, while also providing space for students to study in total peace and quiet. On the basement floor (-1) there will be a new club for student parties (app. 200 pers. capacity). In order to mitigate the effect partying would have on sound levels in the rest of the building, resilient elements were required to ensure the complete acoustic separation of the club, also known as box-in-a-box soundproofing.

To that end, Technum, being the acoustics wing of consultant Tractebel, insisted on a high-performance floating floor in reinforced concrete, suspended on discrete rubber pads. The heavy walls are partially on top of the floating floor, which is why additional rubber pads have been foreseen there. That way the static deflection of the floor is similar everywhere. The heavy walls that are not installed on top of the floating floor have been acoustically decoupled using resilient strips of a specific polyurethane foam providing a resonance frequency of app. 20 Hz. This way, transmission of structure-borne noise towards the rest of the building is significantly reduced. There is also a false ceiling made of heavy plasterboard that has been resiliently suspended from the structural ceiling, completing the box-in-a-box setup.

The floating floor system that has been used is of the CDM FLOAT type, which means that all the components have been prefabricated. Because the works concern a conversion, the existing floor screed was completely demolished; however, this resulted in an exceptionally irregular structural floor, with local differences in height up to 5 cm. This meant that during the CDM FLOAT system’s installation, hard shims had to be installed under the rubber pads in some places, so that each formwork panel could be stably put on the structural floor; however, due to the small surface area of the rubber pads and the relatively large intervals between them, it was still possible to keep this levelling treatment fairly limited. Thanks to the substantial thickness of the used formwork panel, it was also possible to absorb some millimetres difference in the joints. The prefab approach made it possible to install the floating floor system in about two working days, ready to receive the reinforced concrete.

691 Tennessee Recording Studio

Located in the Central Waterfront District of San Francisco, the existing warehouse was converted into a professional recording studio with a live room, control room, ISO room, and a lounge.
WSDG, a leading firm for recording studio design and acoustic consulting provided the engineering services to the client.
Two different types of CDM-HR natural rubber pads were used at varying on-center spacing to accommodate for the floating floor loads, heavy equipment, and concentrated loads from walls and windows.
Working hand-in-hand with the acoustical consultant and following their acoustical specifications and requirements, CDM provided shop drawings with a custom layout, and ensured proper installation on site with a pre-construction meeting, site visits, and post-construction review.

Film Forum Movie Theater

Film Forum is a nonprofit movie theater in Lower Manhattan, New York City. It is the only autonomous nonprofit cinema in New York City, and one of the few in the United States.
With the addition of a fourth theater to the existing venue, quality sound isolation became even more important. The former loading bay of the building was converted into a 109-seat theater and a mechanical equipment room adjacent to the theater. The $6 Mio. renovation project also included updated HVAC system and refurbished interior finishes for the venue.
With CDM-MONT jack-up boxes, CDM provided a vibration isolation design that helped the client maximize the acoustic performance in the venue, while reducing costs from the original design. CDM-MONT was designed to a resonant frequency of 4.5 Hz for the 4” concrete slab, with an air gap of 1” to the subfloor. CDM assisted the design team and contractor throughout all phases, from pre-construction to shop drawings and site installation.

Penn Presbyterian Medical Center

On the 1st floor of a main Philadelphia hospital, a Magnetic Resonance Imaging (MRI) equipment needed to be installed. Vibration transmission from road traffic and its impact on the MRI equipment and its imaging quality was a big concern.

CDM installed a CDM-MONT solution with 2.5 Hz spring isolators in a 10” floating concrete slab. The floating floor was jacked to create an air gap of 2”.

Thanks to an in-house finite element analysis, CDM could design the special springs needed to guarantee the specified isolation performance with minimum differential deflection and tilting of the MRI equipment, while coping with the eccentric loading.

CDM-MONT prior to reinforcement

Installation of spring isolators

Jacking of floating floor

Everyman Cinemas

5 Everyman cinemas have been built in a new building in the centre of Harrogate which houses several other retail and leisure facilities.

The cinema directly above the ground floor retail units required a concrete floating floor whilst the 4 other cinemas required heavy dry floating floors with large floor voids.

CDM-UK supplied and installed the floating floors which consisted of CDM-LAT isolation rails supporting timber/cement board sandwich constructions or CDM-QDECK solution supporting a concrete slab.

The wall isolation and ceiling hangers completed the box-in-box construction delivering the required sound insulation between cinemas and to the retail units beneath.