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Waterproofing of large retail basement in Nottingham
by Safeguard
     
The basement to be waterproofed consisted of a large retail area beneath a store in Nottingham's central Listergate shopping district. The whole basement area had suffered from problems with water ingress which the owners of the property had wished to rectify before letting the basement to new tenants.

The chosen basement waterproofing solution consisted primarily of an Oldroyd cavity drainage system designed to divert water entering the basement towards sump chambers containing pumps which discharged the water outside the building. Certain areas of the basement were better-suited to waterproofing by means of a more traditional "tanking" approach. Various products from the Vandex range of cementitious waterproofing slurries were used in these areas.
     

The installation of the basement waterproofing system was carried out by specialist waterproofing contractor member Peter Cox Ltd. Oldroyd Xv20 high-profile cavity drainage membrane was used to cover the 1100m2 floor area. This membrane has a large 20mm stud size which creates an extra-large cavity behind the membrane, allowing it to deal with higher flows of water than standard-sized cavity drainage membranes.

Oldroyd Aquadrain perimeter drainage channel was laid around the perimeter of the basement to increase flow capacity at the wall-floor junction. Further lengths of Aquadrain were laid across the floor at regular intervals. Jetting points were installed at regular intervals to allow future maintenance of the Aquadrain channel. A wall area of over 750m2 was covered with Oldroyd Xv Clear cavity drainage membrane. This was fixed using special self-sealing fixing plugs.
     
Vandex waterproofing slurries were used to waterproof certain areas of the basement. This allowed the design of the waterproofing system to be greatly simplified. For example, the use of Vandex BB75 waterproofing slurry to tank an area of retaining wall behind a staircase offered a far more straightforward solution than could have been achieved using a cavity drainage membrane.
     

 

Together, these measures form a managed water disposal system and are designed to channel water entering the basement towards ten sump chambers containing dual sump pumps. Any water entering the sump chambers is discharged outside of the building by the pumps.

     
     
     
     
This case study has been submitted by a member and the British Structural Waterproofing Association accepts no responsibility for its content. The photographs in this case study are the copyright of Peter Cox Ltd. 
 


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