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Retrofit Basement in 1850's-built Semi-detached House, Notting Hill, London
   
     
A main building contractor needed advice on a retro fit basement construction as part of the refurbishment of a semi detached house built circa 1850.
     

In accordance with BS8102 Wykamol specified a Type C cavity drain membrane system incorporating both central and perimeter drainage to the front and rear of the basement evacuating to several twin pump sump chambers configured with battery back-up alarm systems.
     
The main contractor appointed an approved basement contractor to carry out the waterproofing works. Wykamol supplied and supervised the installation of two foul and grey waste water pumping stations complete with an additional back flow valve.
     

The basement comprised of staff quarters, living area and  kitchen / dining area leading out to a terraced garden which featured a below ground swimming pool with associated changing rooms and steam room.
     
The top side of the swimming pool slab was waterproofed to a Wykamol specification.
     

The waterproofing challenge was compounded by stepped levels from the front of the property to the back. This led to combined applications of cementitious, liquid membrane and cavity drain membranes to achieve a dry result.
     
     
     
     
     
     
       
This case study has been submitted by a member and the British Structural Waterproofing Association accepts no responsibility for its content. 
 


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