xypex Cottam Power Station

Great Ormond Street Hospital


Xypex was selected as the primary solution. This was part of an integrated waterproofing approach and a change to the original specification. Furthermore, Xypex was chosen to help speed up the construction process. As a consequence, a cost saving was also achieved. Its proven reliability was another benefit, giving reassurance that it would provide effective, long term protection. Xypex Admix C Series was used in the capping beam, top layer of the basement slab as a monolithic pour and in the intermediate slab perimeter. As a result, a Grade 3 (BS 8102:2009) environment was achieved.
Visit the UK Distributor Website

Country Projects Banner



    SMR Projects Ltd.

    Tel: 01295 279747
    Send E-mail
  • Xypex Project

    60 Holborn Viaduct

    London This scheme comprised of basement, ground and 8 upper floors for office use including reconstruction of The Gatehouse will be built to the highest technical specification. Xypex Admix has once again successfully been used in this project as the sole barrier to water ingress. The basement is in the entire footprint of the site and Xypex was selected to replace the specified membrane. Part of the decision to use Xypex Admix was due to its ability to be used in concrete mixes which have a high blended cement content. Xypex is in the entire basement slab, walls and capping beam as well as the lower sections of the slip formed core which is part of the external concrete wall.
  • Xypex Project

    5 Broadgate

    London Three, four and six Broadgate were demolished to allow for construction of a 12-storey office building with two basement floors that will deliver state of the art trading facilities. Xypex was selected to replace the specified external membrane. The main reason for this change to the specification was to simplify and speed up the construction process, and reduce cost. Xypex Admix was used in the capping beam, basement walls and as a topping on the basement slab to ensure the double story basement remains totally dry. Not all walls are lined, so detailing needed to be created to manage and withhold the flow of water laterally where Xypex withheld the hydrostatic pressure.
  • Xypex Project

    Goodman’s Fields

    London Xypex was specified by the consultant engineer to give protection to this massive basement. Used within the pile capping beam for the entire perimeter of the basement, as well as the walls and slabs. Xypex was the ideal selection as the Xypex structure within the concrete means that a continuous crystalline ‘membrane’ can be maintained even though the the basement sections will be cast at different times. So far the entire capping beam, north west block basement and energy centre have been cast using Xypex Admix in the concrete and Concentrate within the joints.
  • Xypex Project

    Moorgate Exchange

    London This Skanska project is an excellent example of how Xypex Admix can be used to simplify the production process of waterproofing and concreting—both to be achieved simultaneously. One of the key influences for the decision making process of adopting the Xypex system as the waterproofing strategy was the total cost saving that was achieved through the whole package. Site attendance and quality assurance procedures were implemented to ensure a trouble-free installation of the waterproofing. The entire basement is cast utilising Xypex Admix and Xypex Concentrate for sealing the joints.
  • Xypex Project

    Eagle House

    London The client and engineer utilised Xypex Admix and Concentrate within its basement slab, walls and first floor podium courtyard area to achieve a totally waterproof structure. After many years standing as a skeletal structure on the London ring road, this development is being completed. The Xypex crystalline structure enables additional Xypex waterproofing to be added at a later date with full integration with the earlier elements, extending the crystalline membrane.
  • Xypex Project

    Grange Hotel

    London The whole basement area, including the sauna and pool facilities, used in excess of 1,300 m3 of concrete containing Xypex Admix. Where there were thick upstands (in excess of one metre thick) Xypex’s ability to be applied as a coating system, as well as an Admix, came into its own as these areas were poured in “plain” concrete and coated afterwards at a time to suit the program. This meant that all of the waterproofing was a Xypex solution despite it being applied in different ways to control cost and time and meant all the waterproofing could be covered under a single warranty.
  • Xypex Project

    88 Wood Street Tunnel

    London The joints of the pre-cast unit and the basement core on level 4 of this service tunnel suffered water ingress. During the repair of the tunnel, water ingress measured 3,500 litres/hour and the entire area was under 44 mm of water during the rainy season. All joints were treated with Xypex Patch'n Plug, Dry-Pac and FCM. Xypex Admix C-1000 NF was then used in the new concrete fill.


  • Xypex Project


    Worthing, West Sussex Xypex was requested by the main contractor and specified by the engineer as the best solution to keep the swimming pool watertight as well as keeping the tidal waters of the English Channel at bay.

    Xypex Admix was used in all water retaining and excluding structures as well as all basement areas as the sole defence. The process of application meant that the contractor had only to consider the placement of concrete allowing the crystalline matrix to form deep within the pores and capillaries to make the concrete watertight and durable within this harsh marine environment.
  • Xypex Project

    Eardley Hotel

    Worthing, West Sussex The Eardley Hotel has a elegant collection of 2 and 3 bedroom luxury apartments on Worthing seafront. Used in this project to exclude and retain water, Xypex has been used exclusively within the basement to resist the tidal waters of the Channel. The ground floor slab of the front gardens is cast using Xypex Admix to protect against standing water. The swimming pool housed within the basement area is cast using Xypex Admix and then further rendered with Xypex Megamix to keep the continuity of the Xypex crystalline structure prior to final tiling.
  • Xypex Project

    Grand Ocean Hotel Apartments

    Saltdean The Ocean Hotel in Saltdean East Sussex is an iconic building in the coastal town. In 1999 the building was listed by English Heritage and in 2007 work started on this project to convert this magnificent art-deco building into 279 luxury apartments. Xypex materials were specified in this design and build project and used in its transformation. Xypex is utilized to waterproof the retaining walls and slabs of the ‘under-croft’ areas.
  • Xypex Project

    Barlockart Wind Farm

    Dumfries & Galloway Xypex Admix was specified by the design engineers as the stand-alone waterproof solution for the plant rooms, and plant room service tunnel to completely seal the concrete to ingress of water and aggressive ground contaminants that could corrode the reinforcing steel.
  • Xypex Project

    Brighton Station Car Park

    Brighton Work started on site in June 2004, and one of the first structures to be built was this two-storey car park for Network Rail. The construction of the upper deck was pre cast concrete planks supported by a steel frame – some of the planks spanned up to 14 metres with a concrete topped wearing coarse. Ultimately this concrete topping wearing coarse had to be directly lined. To ensure there was no water penetration from the upper deck on the parked cars below, Xypex was selected to provide a solution utilising Admix to waterproof the 150 mm thick in situ concrete topping to the pre cast concrete planks. The Xypex Crystalline Technology has the ability to self heal hairline cracks, therefore it is more suitable for this type of installation rather than pore blocking additives.
  • Xypex Project

    Cottam Power Station

    Nottinghamshire As part of the power upgrade, a 12 m deep Coffer Dam was constructed in 2004. Cottam Power Station is located near Retford in Nottinghamshire and is adjacent to the River Trent, meaning that the upgrade works had to withstand a 6 metre hydrostatic head of pressure. The slab was designed and cast utilising Xypex Admix, which not only waterproofs but also enhances the durability of the concrete.
  • Xypex Project

    Highams Park

    Chingford This fantastic 11.2 acre regeneration scheme in Chingford, North London, includes 37,000 sq. ft. Tesco superstore, 24 private sale apartments and business units, was completed in September 2012. The first phase of the development was the basement car park for the Tesco store, the slab was cast against sheet piles. An external suspended service yard was built above this basement car park. The second phase consisted of the residential basement. Xypex admixture was used to minimise time on site as it has no limitations on pore size.
  • Xypex Project

    Lanthwaite House

    Buttermere This luxury, state of the art, residential home in the beautiful but very wet Lake District, has a large habitable basement with an indoor swimming pool, changing rooms, and cinema room. Xypex Admix was used in over 1,200 m2 of waterproof concrete in the basement slab, walls, the indoor swimming pool shell and accompanying balance tanks that are all located in the basement. Additionally, Xypex Patch'n Plug and Concentrate were used to seal the 21 cored penetrations in the pool shell, which house the underwater lights.
  • Xypex Project

    Norton House Hotel

    Edinburgh This 4-star hotel set in 55 acres of Parkland was originally built in 1840 and was bought by John Usher of the famous Scottish brewing family in 1883. ‘Hand Picked Hotels’ undertook a large refurbishment of the hotel, included extending the facilities underground. Having used the Xypex waterproofing system previously the consultant engineers asked if the system would be able to completely waterproof the substructure that was to be constructed with in situ reinforced concrete, including the extensive leisure facilities and the swimming pool.
  • Xypex Project

    One Hyde Park

    London The contractors used a number of Xypex concrete waterproofing solutions for the different areas within the complex. The concrete sections of the roof on each tower, as well as spaces within the basements including the lift cores, the tri-level basement slab, and wall areas within the basement were all treated with Xypex. 
  • Xypex Project

    Rothesay Sea Defence

    Rothesay Southerly winds combined with a rising tide increase the flood tide and funnel water up the Firth of Clyde causing a tidal surge. This led to flooding on a 5-year cycle but, due to climate change, flooding now occurs nearly every year, meaning a solution was urgently required. Argyll & Bute council appointed consultants to design a solution; this involved the construction of a double wall with a maximum height of 1.5 m. To ensure the durability of the double stone faced wall, the in situ concrete infill utilised Xypex Admix as a waterproof system to protect the re-bar from corrosion in this harsh marine environment.
  • Xypex Project

    Sainsbury’s Car Park – Lombardy Retail Park

    Hayes Due to the unique abilities of the Xypex system, the placement of the car park deck could be reduced to just 2 procedures: installing the steelwork and placing the concrete.

    Xypex Admix C-1000 NF was used to ensure the concrete was completely waterproof over the composite deck. As Xypex places no restriction upon the contractor as to the size or aspect ratio of the pours, the concrete was placed in large bays between a proprietary movement joints.
  • Xypex Project

    The Peak, Stirling Sports Village

    Stirling Xypex was specified by the consulting engineers for the waterproofing of the two swimming pools along with the balance tanks. Xypex Admix C-1000 NF was used to waterproof the concrete, whilst a project specific joint system was designed and implemented for all the construction joints, including the kicker.
  • Xypex Project

    The Channel Tunnel

    Folkestone Despite many years of problem free use, it became apparent that there was continuous water ingress within certain parts of the tunnel. After technical investigations and a full technical submittal by ourselves and discussions between all parties a decision was made to use Xypex post applied waterproofing materials to alleviate the leaks permanently. The solution was a combination of the products Xypex Patch'n Plug and Concentrate used in a variety of forms and applications.
  • Xypex Project

    Trinity Square

    Gateshead Because Xypex has no restriction on pour size or shape, Xypex Admix was the contractors chosen waterproofing solution for the basement of this new centrepiece development in Gateshead. Xypex Admix was also used to waterproof the 150 mm structural topping on the suspended car park deck, loading bay ramp and loading bay deck. Additionally, Xypex Admix was used to resolve waterproofing issues that manifested themselves during the construction program with a total of nearly 1,000 m3 of concrete with Xypex Admix being placed.
  • Xypex Project

    Willis Building

    London Most of the material from demolition of the previous building was recycled and crushed for use in the 38-meter-deep foundations. Xypex Admix C-1000 NF was used to waterproof and protect the below-grade slab and elevator pits. Xypex Concentrate Dry-Pac was then installed in all floor-wall joints followed by a slurry coat application of Xypex Concentrate.
  • Xypex Project

    Worcester Library & Historic Centre (The Hive)

    Worcester When there is a concrete thickness of 250 mm, Xypex Admix automatically produces a Grade 4 (BS:8102) ‘archive level’ of protection. For this reason Xypex Admix was the chosen waterproofing solution for all the archive areas in the structure. In addition, Xypex Admix was used to waterproof the basement slabs, walls and podium deck.

Scroll to top