Delta Registered Installer, T W Read Waterproofing Ltd, have extensive experience in providing professional design and installation of waterproofing systems for existing and new build structures.
The Scope of this project was to provide a structural waterproofing solution to a large basement that had been formed below a residency in Streatham, South-West London. These works were originally undertaken by a basement company who had ceased trading. Whilst the excavation works had been completed, no waterproofing system had been installed.
The structure was a built from the 1890-1900 era, usually urban houses of this vintage were well-built and have few structural problems. The basement consisted of two apartments with two light wells and a large courtyard to the rear. At the rear of the property there was also a podium deck that required waterproofing.
Working in collaboration with the architects T W Read Waterproofing Ltd were easily able to offer a simplistic and practical approach. Based on the assessed risk and performance level requirements for the basement – grade 3 in accordance with BS 8102:2009 two forms of structural waterproofing would be required.
There’s no one-size-fits-all when it comes to waterproofing design. With the basement suffering from excessive amounts of leached free lime, Delta’s Type A & C waterproofing systems were put forward as a great solution.
Type A is defined as ‘barrier protection’. A barrier protection which physically holds water back on either the positive side of a below ground level structure (externally), the negative sides (internally) or sandwiched into the construction. Cementitious coatings, bituminous coatings or flexible sheet membranes are categorised within Type A ‘barrier protection’.
Type C is defined as ‘drained protection’. A drained cavity system collects and manages any moisture which breaches the integrity of the structure by channelling, collecting, and discharging such free water via a suitable evacuation point. A Type C waterproofing system will not increase or exert water pressure on a structure nor alter the dynamics of a structure.
Before specifying a robust waterproofing solution, T W Read Waterproofing Ltd attended site to undertake surveys on the property, these detailed studies were carried out to supplement and verify the site information provided by the client, focusing on specific site issues. The client’s main concern was the high volume of free lime (calcium carbonate) which had leached through the new concrete walls at the floor/wall junction and the dry pack joints.
Prior to the installation of a Delta Type C System, all new concrete tends to be treated with Koster Polysil TG 500 to prevent the leaching of free lime, where lime has already leached, Koster Polysil TG 500 acts as a coating system to decrease the likelihood of new salt efflorescence development.
Initially all efflorescence/salts on the surface of the walls were removed via wire brush in preparation for the application of Polysil TG 500, all construction and dry pack joints were sealed using Koster Repair Mortar Plus. In a full belts and bridges approach, T W Read Waterproofing Ltd applied a closed layer of Koster NB 1 sealing slurry to prevent migratory dampness to the light wells, basement, and courtyard.
The Delta Type C internal cavity drainage membrane system is a reliable and completely maintainable waterproofing solution. Prior to the installation of the Delta Type C system, coved fillets were incorporated to the all-important wall/floor junctions to ensure any moisture or running water which will travel behind the membranes in a controlled drainage system will not seep into the structure.
Delta MS 500 was securely fixed to the internal walls of the basement using Delta’s specialist fixing plugs, with Delta MS20 installed to floors.
Below the floor membrane perimeter drainage channels were sited within rebates allowing for suitable drainage of any water ingress being diverted to suitable discharge points, in this case a bespoke sump pump drainage system.
Delta’s pump partners, Package Pump Systems Limited (PPS) designed a bespoke basement drainage solution with pumping stations for the ground and foul water.
After the Type C System was installed the all-important integrity testing was undertaken to exercise the waterproofing system in worst case scenario.
A completely watertight solution was provided with works were carried out to a high standard and delivered on time.
As a particularly experienced Delta Registered Installer, T W Read Waterproofing Ltd were able to confidently recommend, design and install a comprehensive waterproofing system that will protect the property from unwanted water ingress for the life cycle of the structure, much to the delight of the client.
Delta Membrane Systems,
Delta House,
Merlin Way,
North Weald,
Epping,
Essex,
CM16 6HR
United Kingdom
Visit Delta Membrane Systems' website
Embedding sustainability within any organisation requires a broad, strategic perspective. Scrutiny should include the physical infrastructure itself: According to the IEA, buildings consume around 30% of global energy*. ASSA ABLOY has more…
Posted in Access Control & Door Entry Systems, Architectural Ironmongery, Articles, Building Industry News, Building Products & Structures, Building Regulations & Accreditations, Building Services, Case Studies, Doors, Facility Management & Building Services, Information Technology, Research & Materials Testing, Retrofit & Renovation, Security and Fire Protection, Sustainability & Energy Efficiency, Video of the WeekDespite one of the wettest starts to the year on record, customers are starting to plan for brighter days with HydroPro Garden Paint from HMG Paints.
Posted in Articles, Building Industry News, Building Products & Structures, Garden, Innovations & New Products, Paints, Paints, Coatings & Finishes, Restoration & Refurbishment, Retrofit & Renovation, Site Preparation, Sustainability & Energy Efficiency, Waste Management & RecyclingAbloy UK is set to unveil its latest line-up of access control systems at The Security Event 2024, welcoming guests to explore its cutting-edge electromechanical and digital solutions on stand 5/F50.
Posted in Access Control & Door Entry Systems, Architectural Ironmongery, Articles, Building Industry Events, Building Industry News, Building Products & Structures, Building Services, Doors, Exhibitions and Conferences, Facility Management & Building Services, Health & Safety, Information Technology, Retrofit & Renovation, Security and Fire ProtectionIn times of emergency, you’re in safe hands with Strand Hardware. Although there are many considerations for building specification, few decisions can be as critical as selecting the right emergency exit/panic hardware.
Posted in Access Control & Door Entry Systems, Architectural Ironmongery, Articles, Building Industry News, Building Products & Structures, Building Services, Doors, Facility Management & Building Services, Health & Safety, Restoration & Refurbishment, Retrofit & Renovation, Security and Fire Protection