CDM Stravitec

111 The Strand, is an eight storey landmark office and retail building in central London. The property occupies a corner position on the Strand with a return frontage to Savoy Place. The majority of the 30,549 ft² office space is let to CVC Capital Partners.The iconic building is well-known for its contemporary appearance. The limestone façade with metal frames with curved bays of stone and glass, and a stone relief depicting the surrounding area truly stands out.With the recent acquisition of the long leasehold office building, the private equity firm CVC Advisors Ltd found it time for a complete refurbishment. The existing reception area and office floor 1 to 6 were stripped and upgraded to Category-B Standard. This is inclusive of new MEPH installations and a commercial kitchen fit out to service the meeting room suites and dining areas.Stravifloor Channel, a floating floor system using isolated steel channels with proprietary elastomeric pads, four layers of plywood, and a special damping layer was installed in the catering kitchen on the 5th floor of this fit-out project. The isolated steel batten system with enhanced stiffness was designed to minimise the transfer of impact noise to the office floors below.During the installation, an elastic Perimeter Strip was applied around the floors’ perimeter, to completely decouple it from the building structure.

The remarkable 22 Bishopsgate Project stands as the second tallest building in the United Kingdom and Western Europe, showcasing its architectural prominence. On its 58th floor, an awe-inspiring viewing gallery offers breathtaking vistas. Perched even higher, on level 59, a discreetly hinted restaurant is poised to offer an unparalleled dining experience, with a renowned chef at the helm. Although the details remain a secret, the restaurant promises to be a highlight. Beyond its striking stature and exclusive amenities, the project's core objective revolved around enhancing the base build construction to optimize noise levels for the activities and events within the Viewing Gallery. Aiming to strike a balance, the project sought to both amplify the permissible noise levels for these events while curbing any potential noise breakthrough into adjacent spaces.In the dynamic context of 22 Bishopsgate, where concrete installation was unfeasible due to location and occupied lower floors, a visionary solution was sought. Over 1246m², the innovative Stravifloor Channel floating floor system was meticulously installed. In lieu of concrete, a bespoke approach utilizing high mass calcium sulphate boards was designed, ensuring both functionality and practicality. Addressing concerns about floor height, custom-designed bearings were engineered to maintain top-tier acoustic performance, with a mere 30 mm thickness.Despite a demanding timeline to unveil the viewing gallery, the project remained on track. Stravifloor Channel, with isolated steel battens, played a pivotal role. Galvanized steel channels provided robust support over isolation pads, while the optimized discrete supports allowed minimal contact points to the subfloor.

9 Marylebone Lane is a new-build high quality residential building comprising 2 basement levels, lower ground, ground and seven upper floors. The site is located in between Oxford Street and Wigmore Street.The Jubilee Line runs directly beneath the site and the acoustic consultant, Hoare Lea, specified that the building needed to be supported on Stravibase VHS elastomer bearings with a maximum natural frequency of 15Hz.The building is isolated at the base of columns and walls on top of the ground floor slab. Sensitive areas on the ground and lower ground floors are isolated using box-in-box constructions.The bearing stiffnesses were used in the structural analysis to ensure that the correct bearings were used at each support location.The three apartments and the gymnasium that were below the level of the main building isolation were built of Stravifloor Jackup concrete jack-up floating floors to create box-in-box constructions.

Nearly forty years after the lights were switched off at Battersea Power Station, a decommissioned Grade II listed coal-fired power station, located on the south bank of the River Thames, this much loved London landmark recently re-opened to the public following a transformational eight-year restorationApple Inc. will be leasing approximately 500,000 sq ft. across 6 floors of the central Boiler House and plans to move all of its 1,400 London employees to the new venue. This will make Apple by far the largest tenant at Battersea Power Station.221m² of Stravifloor Channel, a resilient high-performance floating floor based on floor channels containing steel springs as resilient supports was installed to decouple the acoustically critical listening, screening and control room spaces at Battersea Power Station.The added insulation material between the channels contributes to the acoustic optimization of the spaces by preventing the so-called standing wave effect to take place within the air void.During the installation of the acoustic floating floor, careful attention was paid to the many service penetrations as improper installation would most certainly lead to rigid connection which in turn affect the system’s performance.

The enormous redevelopment of the site around Broadcasting House is situated between the Bakerloo and Victoria underground lines and the tube trains are clearly audible in all the buildings. Therefore, CDM Stravitec was asked to install floating floors using the Stravifloor Deck system.To protect the BBC W1 technical boxes from structure-borne noise each one was built off a concrete floating floor.The construction of the floating floors depended on the location within the building: in the basement the floors were 125 mm concrete on 100 mm void supported by bearings with a natural frequency of <8Hz.On the ground floor the floors were 90 mm concrete on 100 mm void; the 2nd floor was 90 mm concrete on 75 mm void and the 3rd and 4th floors 90 mm concrete on 50 mm void.

One Tower Bridge is the home for a new 900-seat theatre built for the London Theatre Company on the South side of Tower Bridge called the Bridge Theatre. The theatre is one of the largest to be built in London in the past 100 years.To protect the residential accommodation that wraps around the theatre the acoustic consultant specified that the theatre be built on a 200 mm concrete floating slab supported on springs (Stravifloor Deck). The structural engineers specified that the floating slab must spread the loadings of the theatre structure as much as possible to the supporting structure beneath.CDM Stravitec’s in-house structural engineers used finite element analysis to optimise the load spread of the floating slab whilst retaining the acoustic requirements. The optimised design incorporated 4,300 springs with higher concentrations of springs where the imposed loads were greatest.Reinforcement density was also increased in the higher loaded areas to optimise the load spread characteristics of the slab. The floating slab was installed within a very tight timeframe of 3 weeks in order to comply with the project build programme.

Project Wick is a film studio located within Chiswick Park, which comprises of 1.8 million sq ft of award-winning accommodation, arranged as a necklace of 12 office buildings. Located in London, Chiswick Park is home to some of the world’s leading companies including Starbucks, Qualcomm, Pepsico, Paramount, and Discovery.Discovery Networks Europe, the pan-European arm of leading factual entertainment group Discovery Inc., relocated its European headquarters to the Richard Rogers designed Chiswick Business Park. In the new building there is ample space for offices, screening rooms, and transmission facilities. We were called upon to design and install a box-in-box solution to acoustically isolate the recording studios from the other areas of the building, thereby preventing unwanted noise and vibrations from becoming a nuisance.A Stravifloor Channel floating floor using isolated steel battens in combination with medium stiffness natural rubber pads (Pad-M50) and plywood and soundbloc plasterboards guarantee an isolation frequency of less than 10 Hz.The floating floors in these box-in-box rooms are complimented with our resilient head detail (Stravilink RHD) and Stravilink PHS isolation hangers for the ceilings.

Equinox is a large USA gymnasium operator and their first venture in London is in High Street Kensington. The site they chose is on the 5th floor, directly above Sony Music where Simon Cowell works, and directly beneath Kensington Roof Gardens, which is a popular and very trendy night spot.Ramboll Acoustics specified that a floating floor was required to reduce impact noise levels from the gym to <55dB L’nT,w. However it soon became clear that the floating floor would have to ensure that no significant disturbance was caused to Sony Music directly beneath.Our local branch worked closely with the contractor and consultants to fine-tune the floating floor system and built several mock-ups to verify the performance.The final design consisted of a Stravifloor Channel isolation rail supporting a composite dry floor construction. The floor under Group Fitness, where all of the gym classes are held, also had layers of steel plate to optimise the low frequency performance.The on-site performance at the end of the job was measured as 35dB L’nT,w although this was dominated by background noise as the performance of the floating floor was so good. The improvement from the base concrete floor was 42dB.

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.Our local branch supplied and installed the floating floors which consisted of Stravifloor Channel isolation rails supporting timber/cement board sandwich constructions or Stravifloor Deck 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.

The new Headquarters of Goldman Sachs in London is in a great location on Farringdon Street in the City of London. This massive office development of 1.1 million square feet includes a large auditorium which is isolated to protect it from tube train noise and to protect the rest of the building.Sandy Brown specified that the box-in-box construction needed 10Hz bearings supporting it.Our local branch worked with Byrne Brothers to design supply and install the concrete floating floors and structural bearings. The complicated 3-dimensional space is supported on 5 separate floating floors with bearings beneath designed to take the column loads.The floating floors consist of Stravifloor Deck isolation rails supporting composite metal decking, reinforcement and concrete.Some of the columns are supported on Stravibase SEB bearings located outside of the floating floor areas.The new building has been named the ‘groundscraper’ due to its mammoth size – it will become one of London’s new collection of landmark buildings.

Hotel Café Royal has just undergone a complete refurbishment and internal re-build. Part of the new complex is a state-of-the-art Spa and Gym which is located in the basement. Directly next to the hotel is Regent Street, below which runs the Bakerloo underground train line.Structure-borne noise levels from the trains were far too high to create the relaxing environment required for a top class Spa. The acoustic consultants therefore specified that all of the noise sensitive spaces must be isolated on a Stravifloor Deck concrete floating floor system.Café Royal’s 1,200 sqm Wellbeing Centre provides a personal and intimate holistic experience. It has a large lap pool and four different areas, corresponding to the four natural elements: spa/water, gym/fire, yoga/air and organic bar/earth.The spa offers a variety of Watsu hydro-experiences, a private and communal Hammam and signature Akasha treatments. Moods are enhanced by restorative music, aromas and gentle lighting. The gym has the most advanced fitness equipment, including Kinesis machines. There is a spacious aerobics studio and a private training room. Yoga, Tai-Chi and Pilates are offered in the calming area, with bespoke classes.

With the success of Media City, Manchester has now become the Media Centre of the UK and the best place to study for a job in TV, Film and Radio.Manchester Metropolitan University has built a brand new Media Facility with industry standard studios to allow them to teach students in the highest quality spaces.Our local branch was employed to design, supply and install the concrete floating floors for 12 studios.The 100 mm thick concrete floating floors supported the drylining walls and ceilings to create box-in-box constructions with very high standards of sound insulation.The 50 mm void beneath the 100 mm concrete floating floors was created using Stravifloor Channel isolation rails and the voids were vented to avoid the trapped air layer reducing the isolation performance.Most of the studios were supported off stiff structural slabs with a natural frequency of >10Hz and the specification for the bearings was given as <8Hz.One of the studios, however, was supported off a supporting slab with a natural frequency of 6Hz and the specification for the bearings was changed to 12Hz in this studio to avoid structural vibration amplification.

Based at Manchester’s waterfront in Salford Quays, MediaCityUK Studio Block is the largest media development in the UK and will become centre for the world’s leading creative and digital businesses. The BBC is one of mediacity:uk’s anchor tenants and from 2011 it will be home to five BBC departments including two TV channels and two radio stations; three of them are Radio Five Live, BBC Sport and CBeebies.Many of the studios in the main Studio Block have Stravifloor Jackup jack-up concrete slabs to optimise the sound insulation between noise producing and noise sensitive spaces. These floating floors in combination with the structure of the studios being isolated off Stravibase SEB simple elastomer bearings delivering high performance box-in-box constructions.The TV studios built off the upper floors were built using a heavily damped concrete construction supported at 600mm centres using Stravifloor Deck isolation rails. In these studios the structure of the studios was built off the floating floors to create the box-in-box whilst providing very stable conditions for the TV cameras.

As part of cultural regeneration of the Olympia Exhibition Venue, Olympia Central Hall has been demolished and the iconic structures of Olympia National and Olympia Grand, both Grade II listed buildings, are being incorporated into the site’s overall redevelopment. The West Hall Exhibition Space is being structurally strengthened to allow for a two-story music venue to be constructed above the existing exhibition hall.It is necessary to isolate the Central building, originally known as Empire Hall, from the West Hall performance space to prevent music and entertainment noise disturbance.Three massive bearing assemblies comprising solid thick steel plates holding Stravibase VHS bearings, which were pre-compressed using our patented frozen bearing technology.A small mock-up (approx. 1/3 of the size) was also constructed, and fire tested at Liege University, comfortably achieving a two-hour fire rating.Music and entertainment noise breakout from this new venue causing disturbance to residents.A custom designed Stravifloor Deck solution with rubber bearings isolating the concrete roof flab from the structure below. This complex floating roof is laid to multiple falls by using supporting rails that are tapered to suit.

Places for People, a group of more than 20 housing providers, developers, property managers and care providers, and known for their full-spectrum approach of placemaking, called upon CDM Stravitec to isolate a gym in one of their latest commercial property developments.Like many other contemporary office buildings, Places for People’s latest project houses a gym. People working in the building can make use of this popular amenity before or after work or during their lunch-break. In order not to disturb those working in the surrounding spaces, the gym needed to be acoustically isolated from the rest of the building structure.A tailored Stravigym XP gym floating floor was installed to acoustically decouple the gym located on the 5th floor of the office building, preventing vibrations from fitness equipment such as falling dumbells, kettlebells, and treadmills from disturbing the people working above and adjacent. The added dBooster® strips increase the system’s performance even further, by decoupling the load distribution layer from the resilient supports.To achieve the finished floor height specified by the architect and to deal with any irregularities of the structural floor, timber chims were placed underneath the dBooster® channels.

Premium acoustics are a quintessential part of any modern-day theater or performance space. Noise coming in from other rooms or even from outside can disturb live performances.In ‘s-Hertogenbosch, the Netherlands, construction of the new performing arts theater is well underway. Planned to open in the second half of 2023, ‘Theater aan de Parade’ will house 2 multifunctional halls, each with its own atmosphere and programming. The different spaces are all connected by spacious foyers, with plenty of natural light and views of the Parade, the main town square.The new theater is designed to invite passersby to come in, enjoy one of the many performances or simply hang out and relax.The solution selected to acoustically decouple the multifunctional hall, one of the 2 main halls of the building, from the rest of the theater, was a complete box-in-box construction, using a Stravifloor Jackup-R floating floor system.The total hall surface area is about 543 m², divided over three zones. An impressive 272 boxes were installed. Boxes were installed with 2 different types of springs combined in three different configurations. The overall span between the boxes in this project is around 1,4 to 2 m.The added value of a jack-up system in this specific project was that despite the loads not being homogeneously distributed across the entire surface, it is possible to create a stiff concrete slab with a homogeneous thickness before to place it on springs.A jack-up system allows for better control of the slab level across all construction phases, concrete slab thickness, and the final deflection of each bearing, different in number, type and tributary area.The entire installation process was spread across two phases, the installation of the boxes together with the insulation material and PE-foil which took less than one week, and the second phase in which we were jacking up the boxes until the entire floor was raised to the desired level. This last step took 4 days, including cleaning and preparing the area for the next intervening parties.

The new Springs retail and leisure facility at Thorpe Park, Leeds, includes cinemas, shops, restaurants and a gym.Part of the development was to build a state-of-the-art gymnasium for PureGym.The acoustic consultants specified CDM Stravitec to design and build a dry damped floating floor as part of the shell and core to ensure that the gymnasium did not disturb the restaurants and shops located directly below.The Stravifloor Channel floating floor was to be installed within a tight four week deadline and this was successfully completed.