Case Study / Waterproofing 

Wentworth, Surrey

Large new build basement waterproofing to a luxury estate

Wentworth, Surrey

This large prestigious new-build property in Wentworth, Surrey had a very large basement area which needed to be waterproofed to meet BS8102 requirements (the British Basement Waterproofing Standard for the Protection of Structures Against Water from the Ground)

Because it is not possible to determine the amount of potential water pressure surrounding a structure, Basement Waterproofing Standard BS8102 tells the designer to expect a head of water against the structure. In addition, BS8102 requires that all Basement waterproofing is maintainable and repairable.

The Maclennan Basement Waterproofing Design Team worked closely with the client. After consultation Maclennan put forward a comprehensive basement waterproofing system design, that would meet all the requirements for this prestigious new build basement.

Wentworth, Surrey
Wentworth, Surrey
Wentworth, Surrey


MacLennan were commissioned to design, supply and install a Cavity Drain Waterproofing System. The System-08 system was deemed the best range of products for the project as it provides a maintainable waterproofing solution - and thus meets the requirements of BS8102.

The Cavity Drain Membrane was applied to all internal walls, and any potential water ingress would be collected into the Basedrain channels throughout the perimeters of the wall/floor junction and pumped out to safe drainage using the pumping system.

The deck area above the basement and the garage forecourt area also needed to have waterproofing protection, and so Polyprufe was spray applied followed by a drainage sheet.


Maclennan came up with a risk-free waterproofing strategy, to waterproof the very impressive and luxurious property being constructed.

All work was carried out within budget and within the agreed time constraints, the property is completely protected against water ingress.

The design of the Waterproofing is covered by MacLennan's 10 million PI and covered by our warranty.


"Wentworth Estate is an area of homes and woodlands extending across more than two and a half square miles in Virginia Water, Surrey, England. Originally a relatively small country estate, it was named for its eighteenth century owner, Mrs. Thomas Wentworth, widow of Col. Thomas Wentworth who fought against Charles Edward Stuart in the Jacobite rising of 1745. The main house was built in 1805 for Culling Charles Smith, who was to become the brother-in- law of the Duke of Wellington. In the early 1850s Ramon Cabrera, the exiled Spanish Count de Morella, acquired the property and in 1854 moved into Wentworth with his English wife. After his death, the Countess de Morella bought most of the adjacent lands to form the present Wentworth Estate. Some of the current road names are reminders of these former owners."

Wentworth, historic picture

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