Product / system manufacture
Walter Lilly, MacLennan-LSE
MacLennan-LSE, a Newton Specialist Basement Contractor, was commissioned to work with the architect on the Roundhill new build basement project in Hampstead, North London.
The company was to design a robust structural waterproofing scheme to achieve a Grade 3 habitable environment for the extensive project.
MacLennan-LSE designed and installed a combination system of Type A sprayed Polyprufe and Type C drained cavity protection Newton System 500 to waterproof the new build basement.
The internal system involved “curtain hanging” the Newton 508 membrane to all internal 250mm thick reinforced concrete retaining walls as a means of diverting any water that was to enter through the construction joints to the wall floor junction. At the wall floor junction, Newton Basedrain was installed within a layer of “closed cell insulation” with another layer of Newton 508 installed on top of the insulation layer.
With the layers insitu, a 65mm screed was installed with underfloor heating embedded prior to the wall finishes (independent dry lining system) being installed. With the Newton 508 membrane raised up higher than the top of the Basedrain, any water ingression was then displaced through the weight of the screed back to the Basedrain for removal to dual sump and pump systems.
MacLennan-LSE was able to install the combined system in the middle of winter with adverse weather conditions not affecting the installation time as is often the case with external waterproofing applications.