When the Merlin Groups York Dungeon (basement) attraction suffered flooding in association with substantial and repeated rise of the nearby River Ouse, they considered what could be implemented to reduce future risk without detriment to the listed structure.

More specifically, it was not practical, or sympathetic to upgrade the structure to a condition in which it could adequately exclude water and resist the potential hydrostatic pressure.  As a result, a strategy was developed, which in part included the ability to remove substantial quantities of water, in the event that this should penetrate.

Trace have previously advised on the waterproofing design at one of the groups new-build hotels, and were asked to advise on what could be employed to address the potential ingress.

A substantial sump chamber was installed, which received three pumps supplied by John Newton & Co.  We specified the world's largest commercially available single phase pump, with a 90mm diameter discharge pipe, 62kg weight and 2.2kW power draw; capable of moving 1,200 litres per minute.

This was supported by two smaller 750w pumps, which could be operated by battery back-up, (whereas the larger pump could not), so that redundancy against power outage was included.

In total the system will move close to two thousand litres, or two cubic metres of water per minute.

Mill & Old Swan, Minster Lovell

River Rooms, Mill & Old Swan, Minster Lovell

New case study up on the site illustrating works undertaken to address issues of dampness and water penetration at the River Rooms, the Mill & Old Swan, Minster Lovell.  Trace acted as main contractior on the scheme, managing the strip out, waterproofing and reinstatement works in-house, from design through to completion.  Full case study at http://tracebasementsystems.co.uk/mill-and-old-swan.php

Bolton Wanderers training ground

Bolton Wanderers Training Ground Facility

New case studies going up on our site at the moment including a nice remedial waterproofing project at Bolton Wanderers training ground : http://tracebasementsystems.co.uk/bolton-wanderers-training-ground.php

It goes without saying, we are all huge Wanderers fans at Trace !

Nice photo (albeit in poor light), showing the use of a clip-rail system to install underfloor heating pipes over a cavity drainage damp proof membrane prior to screed application, on this remedial project addressing a problem of external tanking failure.  The clip-rail detail is important since it negates any requirement to fix through and therefore puncture the DPM.

membrane with UFH 1

membrane with UFH 1

This photo also illustrates the use of treated timber battens fixed and squared up ready to accept dry linings.  While many form independent studs which is quicker (cheaper), this typically loses excessive space while battens are extremely sturdy and maximise the size of the finished room.

We are in the process of adding a raft of case studies to the website covering a range of project types.  Check out:



Hope these make for interesting reading!

Case Studies

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