Sandown Court, Preston

Flat roof overlay using Triflex ProTect
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A high-rise block of flats in Preston urgently needed a new waterproofing solution for the west tower roof as its existing system had failed, trapping water in between the build-up layers causing water ingress and localised flooding to the penthouse apartments directly below
Authorised Contractor
Permicoat Ltd

The challenge

Sandown Court Triflex ProTect

A high-rise block of apartments in the centre of Preston was in urgent need of a new warm waterproofing system for a flat roof as its existing waterproofing system had failed, resulting in the penthouse suite experiencing localised flooding. Triflex Authorised Contractors, Permicoat Ltd were tasked to provide an in-depth specification as a final solution for replacing the failing waterproofing system.

Considering the logistics of installing a new system on a high-rise tower where access was limited, Permicoat needed materials that were easy to transport and manoeuvre. The removal and disposal of the old waterproofing system would also prove difficult on such a tall property. Exposure of the existing roof build-up during installation had to be considered, as high winds and seasonal rain had been forecast. Triflex’s PMMA Based Liquid technology ensured that they could work quickly within the seasonal weather windows as the products are cured and ready within 40 minutes.

The proposed, build-up was to include the primary concrete substrate, which was 40 years old, asphalt, tissue faced PIR Insulation and the Triflex ProTect waterproofing system. With our strong technical and on-site support, proven reputation, and experience of PMMA waterproofing systems, the client was confident that Triflex would provide the best solution.

The solution

Sandown Court After Triflex ProTect

Following a thorough investigation from Permicoat and Triflex, we were able to establish the build-up of the current system and put forward a project specification proposal for a Triflex ProTect Warm Waterproofing System that also include an alternative option for a direct application to the in-situ underlaying asphalt layer, providing a cost saving measure, on the proviso that this layer was in a clean, dry, stable and suitable condition to receive the new system. As the works commenced, Permicoat discovered that the existing asphalt was in a sound condition and as a result would provide a robust vapour layer and allow the subsequent overlay of the remaining elements of Triflex warm roof system. Triflex ProTect has a wet-on-wet applied fleece reinforced system and is fully compatible when overlaying existing substrates and warm roof elements, providing a seamless, reliable waterproofing membrane.

James from Permicoat Ltd says, “After the initial site visit and roof survey of Sandown court It was clear that the roof was in desperate need of some major works. The existing roof was installed around 6 years ago and was possibly in the worst state I or my colleagues had seen a roof. The complete roofing membrane and underlying insulation had de-bonded in its entirety from the concrete slab deck with other areas where the membrane was peeling away.”

Detailing including abutments, upstands and penetrations required a tailored specialist solution. Triflex ProDetail and Triflex ProFibre were specified to provide this solution. Triflex ProDetail is also a fleece reinforced, wet-on-wet application system, with a thixotropic formula that allows it to be installed onto vertical and even inverted surfaces without fear of ‘slumping’ or product loss. For more complex details that proved cumbersome to waterproof or hard to reach, Triflex ProFibre was proposed as it contains individual re-enforcement fibres within its resin body, making it easier to apply with a brush. The individual fibres interlock to provide additional strength and re-enforcement.

James at Permicoat continues, “Our client expressed their disappointment in the way that the original product manufacturer and installing contractor had failed to offer any form of support. Naturally, our client requested an alternative solution to that previously installed which is when we opted to introduce Steve Baddeley, Business Development Manager at Triflex. Triflex was the chosen product because we know of the superb back-up that we can expect to receive from Triflex and that the Triflex ProTect system is one that we believe to be one of the best in the market.”

All Triflex resins are contained in tins which made the challenge of transportation straightforward and the contractor was able to easily manoeuvre the goods to roof level unlike other bulkier waterproofing systems. The systems specified are all cold applied and rapid curing which allows works to be completed throughout unpredictable autumn months. Permicoat Ltd were able to apply the waterproofing within weather windows as Triflex becomes rainproof in as little as 30 minutes.

During the project, Permicoat Ltd also wanted to ‘showcase’ their skills and demonstrate the product’s capabilities by adding a Triflex Logo to the installation for visual effect.

Works were completed to schedule by September 2020 with a high level of workmanship. The finished high-rise warm roof system should provide a reliable and lasting waterproofing to the Sandown Court Apartments for many years to come.

James from Permicoat states, “Both Steve and I attended a meeting with the Sandown Court Management committee to talk them through the entire process, from our initial findings during our site survey, proposed specification, technical support and how the works would be monitored by both Permicoat Management and Triflex. The time spent with our clients to go through the presentation was well received which left them feeling reassured that they were using a reputable manufacturer and contractor both with a track history of high-quality applications. We thoroughly enjoyed working on this project with Triflex and think that the finish project looks fantastic.”

Sandown Court After Triflex ProTect

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