|Project scope||Structural waterproofing|
|Services provided||Product / system manufacture|
|Date completed (year)||2012|
|Contractor||Mace, Stonehouse Basements|
The existing tunnel network connecting London Bridge Underground to The Shard needed to be upgraded to house facilities for the Transport for London bus drivers as a part of the overall London Bridge Quarter development.
The main contractor Mace, commissioned the services of Newton and Stonehouse Basements, a Newton specialist basement contractor to design and install the Newton System 500 internal drained cavity system to upgrade the existing tunnels to a Grade 3 Habitable environment in accordance with BS8102:2009.Solution
Stonehouse Basements design was to install the BBA certified 508 Cavity Drain Membrane to the vaulted areas. The 508 has an integral key for direct/plaster applications and is mechanically fixed with Newton NuSeal plugs with Newton WaterSeal rope wrapped around the neck of the plug to form a waterproof seal.
The meshed membrane application required strategic mechanical fixing to hold the weight of the applied finish. Once the membrane was installed to the walls, timber battens were applied into the heads of the NuSeal plugs in preparation for receiving plasterboard. Fixing into the head of the NuSeal plugs meant that the membrane system was not compromised as the NuSeal plugs act as a waterproof rawl plug.
Newton Basedrain was installed at the wall floor junction within a margin formed in the concrete slab. Newton 101F slurry was applied to the rebate and also out onto the slab to prevent moisture vapour transgressing out across the slab.
As the project was at first floor level, any ingression of water was managed into the Newton Basedrain conduit and removed from the internal space to lower level gravity drainage.Benefits
The Type C drained cavity protection option meant no messy preparation works to the existing vaults and that any water ingression could be easily removed without the need for a sump and pump option.
As the project was very time sensitive, there was no need for extensive drying out times as required with other Type A tanking alternatives.
In addition Mace, the main contractor, could get the benefits of an insured backed guarantee by using a Newton specialist basement contractor for the design and installation.