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We specialise in service reservoir refurbishment and regularly work with water authorities and utilities companies throughout the UK and Europe.

Potable water reservoirs require an impermeable roof structure to prevent leakage and contamination leaking in through the roof and into the reservoir. A membrane can be installed over the existing concrete surface. Usually the underground reservoir roof will be landscaped in order that it blends into the surrounding environment. Our experienced technicians are able to provide waterproofing systems to suit specific site applications.

TPO and HDPE have been successfully used in the Water Industry for over 20 years serving new and old structures which have failed integrity testing.

TPO and HDPE can be produced in various thicknesses and can be manufactured or fabricated into large sheets for instant protection, which mitigates the problems caused by the vagaries of weather conditions.

The installation process benefits from modern welding techniques which are world renowned. The normal method is in the form of ‘hot air’ or ‘hot wedge’ sealing along with an extrusion process using Leister machinery. Each weld can be independently tested to ensure its integrity along with a complete test of the system prior to covering.

This system can be applied to most structures and connection points, including access areas, pipe services and up-stands, using a combination of brush applied liquids and termination belts.

TPO and HDPE can be laid directly onto the substrate or, where necessary, an underlay can be placed prior to the TPO and HDPE installation. Above the waterproofing liner either an overlay or drainage mat can be placed to complete the system.

WLS provide highly qualified technicians to assist and supervise project installations throughout UK and Europe

Testing “Double Seam” Welds

All tank membrane, with the exception of the details, are welded to each other using automatic “double seam” thermal fusion welding machines.

This system involves welding together two strips of material (seams) by hot wedge or hot air, overlapping the edges of adjacent sheets, leaving a channel between the two welding lines.

This form of welding allows the pneumatic seal of the overlaps to be tested by blowing compressed air into the channel at a pressure of about 2 bar.

It is clear that a positive pneumatic test means that, the seams are welded perfectly without any margin of error.

MIT Integrity Testing

On completion of the lining works an independent validator will electronically scan the entire surface including welds.

The electrical current will identify any damage or defect in the lining materials that may have be caused by installation, manipulation, transit, or following trades.

On completion a certificate of conformity is supplied.

Project photos

Case Studies

The following projects involved Waterproofing