Waterproofing a Basement Swimming Pool and Cinema, Tunbridge Wells

Summary

Basement Extension Beneath a Georgian Villa, Tunbridge Wells

Newton Specialist Contractor MJ Rooney undertook this extensive basement construction project beneath a period Georgian property in Tunbridge Wells, Kent.

Working alongside designers from Open Architecture and Croft Structural Engineers, the MJ Rooney team needed to carry out deep and large-scale excavations. This included significantly extending the existing basement beneath the period property and the rear garden, whilst retaining the original structure above with minimal disturbance.

The scale of the basement extension included the existing Georgian basement and the area beneath the garden

Robust Temporary Works

Complex temporary works were designed to support the house on stilts during the excavation. Steel sheet piling was also essential to provide support around the site.

However, this wasn’t without its difficulties. The deep excavation works took place within the water table, and restricted site access was problematic for both the piling rig and during the new basement construction. Read on to see how the MJ Rooney team overcame these challenges.

Deep excavations were required into the water table in order to achieve the required depth for the new basement swimming pool

Project Scope

The large-scale new basement area was to include a swimming pool, leisure area, sauna, steam room, and cinema. All areas therefore needed to be completely dry, defined as a Grade 3 environment by BS 8102:2022. This required a waterproofing design that would account for the specific requirements of the site environment and the structure.

The new basement area included a combination of existing underpinned structure and new reinforced concrete

The Solution

The primary solution was a full internal cavity drain system utilising our comprehensive CDM System. But first MJ Rooney primed all concrete surfaces with CDM 906 Lime Inhibitor to prevent any ‘free lime’ from affecting the CDM System.

CDM 508 membrane was then installed to all walls to capture water. The CDM 520 eco Floor membrane also provided high volume drainage capacity across the floor.

A perimeter drainage system using CDM BaseDrain delivers any captured water to a Titan-Pro sump chamber with dual pumps for safe and reliable water removal.

The Result

MJ Rooney’s meticulous approach ensured minimal disruption to the residence while delivering a high-quality, functional new basement in compliance with BS 8102. They also demonstrated their capability by supporting the installation with a 10-year insurance-backed guarantee.

Testimonial

“MJ Rooney were extremely professional in every respect. They completed a first-class construction job. I would recommend and use them again.”

Newton Specialist Contractors

We always recommend that our systems are installed by one of our nationwide network of Newton Specialist Basement Contractors (NSBCs). All members of the network adhere to strict criteria and are required to demonstrate quality workmanship, resulting in a meaningful scheme that provides unsurpassed technical excellence.

Newton Specialist Contractors can also act as the waterproofing designer on your project, taking on the liability under their professional indemnity insurance. Finally, they also offer insurance backed guarantees to support their installations.

For further information on our specialist contractors, please speak with a member of our team. Call us on 01732 360 095, email tech@newtonwaterproofing.co.uk, or fill out the contact form below, and we will respond within 48 hours.