Wykamol have been lucky enough to provide design advice and materials for one of these investments; a sizable basement conversion to create space for a retail unit, bike storage, plant rooms and a heating substation.
Refurbishment was originally undertaken by main contractor Carillion and sub-contractors Macai, who contacted Advance Property Preservation Ltd, due to their specialism in basement waterproofing. Advance Property, alongside Wykamol’s Structural Waterproofing Director, David Jeffries, put together a waterproofing specification compliant with BS8102:2009, containing both Type A and Type C systems.
Brick vaulted arches and light wells within the concrete soffits meant an easy to apply, cementitious product was necessary to allow for these difficult areas. Hydradry, with its BBA approval, was therefore applied, as it’s formulation makes it versatile in application. Hydradry can be applied by brush, roller or spray and a combination of these 3 applications was used in the basement of St Barts hospital to ensure accurate coverage. This catered for the Type A waterproofing system.
Cavity Drain Membranes were also applied to the internal floors and walls. Around 400 metres of Wykamol CM20 membrane was applied to the floors of the basement and around 1000 metres of Wykamol CM8 membrane was applied to the walls! The highly flexible CM8 membrane was ideal to apply to the vaulted arches, ensuring complete coverage at every angle.
Drainage channels were installed at all floor to wall junctions, and special care was taken here to ensure all water could be diverted towards the sump and pump locations, due to the multi-levels of the basement. Four high capacity sumps and pumps will be installed by the main contractor at a later stage, to cope with any ingress of water in this immense, subterranean structure.
Advanced Property Preservations have an impressive array of projects and testimonials on their website, and with the help of the Wykamol Technical Team, these Wykamol Registered Installers did an outstanding job on this complex project.
Wykamol offer a bespoke design service for structural waterproofing projects, unlike any other company in the industry. Most companies will not take responsibility for the design work of large scale projects such as this one, but with our highly knowledgeable team, we will ensure your designs are compliant with British Standards from start finish. No project is too big or small. Just call your Area Technical Manager or Head Office on 0845 400 6666.