Delta Type C cavity drainage system was used for structural waterproofing of a vaulted basement at a property in central London, which had already been converted into high-end living accommodation. Just off the basement area were two large vaults around 12m long. Made from brick barrel construction, this below-ground space had previously been used for storing kegs of ale.
One of these vaults had previously been converted into a spa area with jacuzzi and steam room; the other was used as a storage area. The owners had previously had the storeroom tanked with a Type A render system, but this approach had repeatedly failed, allowing for substantial water ingress which was causing damage to items stored in this area.
Delta registered installers, Advance Property Preservation Ltd, undertook a thorough site survey and investigation. The site was found to be directly below a road, and it was evident that vibration from traffic was causing the existing render system to crack, which was resulting in frequent water ingress.
Advance Property Preservation Ltd proposed installing the Delta Type C cavity drainage system along with mechanical ventilation. Delta Type C allows for slight movement and vibration without altering the dynamics of a structure.
In principle, a cavity drainage system allows for moisture or running water to travel behind the membrane in a controlled drainage system, whilst requiring minimal preparation and disturbance to an existing substrate.
Delta MS 500 was installed to walls and barrelled ceilings, with Delta MS20 loose laid and joined to the MS 500 wall membrane laid to the floor with a protective screed subsequently poured on top. Below the floor membrane perimeter drainage channels were sited within rebates allowing for suitable drainage of any future water ingress and being diverted to suitable discharge points.
Advance Property Preservation also considered the final operation, ensuring the Type C System was serviceable and that future and ongoing maintenance was possible.
After the Type C system was installed, walls and soffits were battened and boarded with moisture-resistant plasterboard and plastered over. Once complete, the walls were painted with an anti-mould paint, with insulation and timber oak flooring then being laid.
A moisture-sensitive, humidistat-controlled fan was fitted as well as new lighting to give the client a new dry storage space.
The clients were delighted with Advance’s approach. Any structural waterproofing is a technical and design driven approach. By the customers engaging with Delta Registered Installers, Advance Property Preservation Ltd wasable to sequence the works in just three weeks. Key matters which significantly impact the efficiency of the site installation were immediately identified in the initial site inspection, allowing for a solution to be created.