Case Study / Waterproofing 

The Co-op, Petworth

Making use of a damp basement in a listed building

The Coop, Petworth

The Co-op shop in Petworth Village required updating and making use of a damp basement.

The site incorporates two Listed Buildings, including part of a Listed Church.

The store applied for listed building consent to reconfigure its ground and basement floors to increase the retail floor space and improve the functionality of the store.

Work would involve moving partition walls, relocating the kitchen and excavating additional space in the basement to install a scissor lift and a new staircase.

The basement of this listed building had obvious sign of damp and could not be used as a functioning space.

The Coop, Petworth


Maclennan Waterproofing worked closely with the Principal Contractor HB Projects to design, supply and install a waterproofing solution that would be sympathetic and mindful in preserving this historic building.

After assessing the condition of the existing basement, it was suggested by the specialist waterproofing surveyor that a ventilated cavity membrane should be installed from floor to ceiling, with a perimeter drainage channel around the wall floor join and wall mounted inspection ports to allow easy access for inspection cameras to check the channels during servicing. A sump and pump were also suggested to carry away any potential water ingress. These are critical with complying with the latest British waterproofing standards.

The works were carried out by Maclennan’s fully qualified, expert technicians and installed to the highest quality.

This waterproofing system does not cause any ill effects to the listed building. It protects finishes to the walls from the damp and creates a warmer, dry and habitable environment.


The local village shop now has a fully functioning and completely dry basement area which can be used for storing their extra stock and also as a staff area and office space,

MacLennan completed the works within budget and agreed time scales and provided full company guarantee. All design and works are covered by Maclennan’s 10 Million PI.

The Coop, Petworth

3d Details

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