Marks & Spencer Putney - Highly Commended by the LRWA

This recognition reflects the transformation of a long-neglected, derelict building into a modern, high-performing commercial asset. Having stood vacant for almost eight years, the structure had deteriorated significantly, with widespread damage, failing roof systems and the presence of asbestos adding further complexity. What followed was a highly technical and carefully coordinated programme of works, requiring a bespoke waterproofing solution across a complex and varied roof structure.

Working in close partnership with APA Building Solutions, Proteus Waterproofing delivered a fully integrated liquid waterproofing solution across a 1,200m² roof area, incorporating multiple substrates including concrete, timber decking and Woodwool slabs.

This was far from a conventional roofing project. Each section of the roof required a bespoke approach, with Proteus undertaking a detailed technical assessment to determine where full replacement was required, where existing elements could be retained and how new systems could be seamlessly integrated across a highly fragmented structure.

The result is a fully refurbished, high-performance roofing system that not only meets modern compliance standards, but restores long-term durability and functionality to a building that had been out of use for nearly a decade.

The Challenge

The complexity of the project was driven by a combination of structural condition, site constraints and technical requirements. The building’s roof was effectively a patchwork of different deck types, many of which had suffered from years of neglect, water ingress and in some areas, fire damage. This required extensive strip-out works, including the removal of compromised Woodwool decking and the installation of new structural elements.

The presence of asbestos across the roof added a further significant safety and logistical challenge, requiring strict adherence to removal protocols before works could progress. At the same time, the introduction of new falls across multiple interconnected roof zones required careful coordination to ensure effective drainage without compromising the integrity of the structure.

Further complexity arose from the integration of pitched and flat roof areas, each requiring different build-ups and detailing solutions. Thermal performance targets also had to be achieved across varying substrates, necessitating weighted calculations and the use of tapered insulation to ensure compliance across the entire roof envelope.

Restricted site access added another layer of difficulty, with limited space for materials, plant removal and waste management, all while accommodating multiple trades working simultaneously.

The Solution

Proteus designed and delivered a robust, fully integrated waterproofing system using its Pro-Cold® liquid applied technology, supported by a built-up roofing (BUR) system tailored to the specific requirements of each roof zone.

The system build-up included:

· Proteus Pro-Cold® Embedment Coat

· Pro-Force 225 Reinforcement

· Proteus Pro-Cold® Topcoat

This approach allowed for a seamless, flexible waterproofing layer capable of accommodating the complex geometry and varied substrates across the roof.

A key aspect of the solution was the introduction of a coordinated drainage strategy, achieved through the use of tapered insulation and timber firrings to create effective falls across all areas. This ensured long-term water management performance while maintaining structural integrity.

The pitched roof areas were fully renewed, incorporating new timber decking and integrated guttering solutions, while ensuring compatibility with the liquid-applied system. Particular attention was given to preventing condensation and ensuring continuity between different roofing elements. A final additional topcoat was applied across the entire roof following completion of other trades, ensuring a consistent, durable and high-quality finish.

Exemplary workmanship

The quality of workmanship delivered on this project was exceptional, particularly given the challenging site conditions and the number of trades operating simultaneously. Each section of the roof was treated as an individual element, with precise detailing applied to upstands, penetrations and interfaces. The liquid coating was applied with meticulous care, with roller marks aligned consistently across the surface to achieve a uniform and professional finish.

Visual detailing was also carefully considered. Upstands, plinths and penetrations were highlighted using contrasting colours, enhancing clarity while showcasing the precision of the installation. Walkways were clearly defined, combining safety with a clean, structured aesthetic.

Protective measures were implemented throughout the project to safeguard completed areas from damage by other trades, ensuring that quality was maintained from installation through to final handover.

The success of the project was underpinned by a proactive and collaborative approach to problem solving. The integration of sloped and flat roof areas required bespoke detailing solutions to ensure continuity of the waterproofing system and effective water movement. At the same time, the roofing works had to be carefully sequenced around ongoing internal fit-out activities, requiring constant coordination and flexibility.

Logistical constraints were managed through precise planning of deliveries and material handling, ensuring that works progressed efficiently despite limited access and storage.

The team also demonstrated exceptional adaptability in responding to site conditions, including accommodating changes from other trades and ensuring that all works remained aligned with programme requirements.

Aesthetic outcome

While performance and durability were critical, the finished roof also delivered a strong visual impact. The consistent application of the liquid coating created a clean, uniform surface across the entire roof area, while crisp detailing to upstands and parapets enhanced the overall finish. The use of contrasting colours for key elements also added clarity and reinforced the quality of the workmanship.

The result is a roof that not only performs to the highest standards, but also reflects the professionalism and attention to detail of the installation team.

The successful delivery of the Marks & Spencer Putney project demonstrates Proteus Waterproofing’s ability to design and implement high-performance liquid roofing solutions on complex, large-scale refurbishment schemes.

Despite significant technical, logistical and safety challenges, the project was completed to an exceptional standard, restoring a previously derelict building and providing a durable, future-proof roofing system. Its recognition as Highly Commended at the LRWA Awards is a testament to the quality of design, workmanship and collaboration achieved across the project.