In a complex new build roofing project that was deemed almost impossible, Contour Roofing stepped up to the challenge with a Sika Sarnafil membrane to achieve truly stunning results.

32 Ewart Grove, a Paul Simon Homes residential development minutes from Wood Green tube station, required a high-performance roof with a striking aesthetic result to match the contemporary luxury flats within. Located in a prominent position at a fork in a road, the roof can be seen when travelling up to the building, as well as from the upper floors of surrounding buildings.

With its extremely intricate design, including two barrel roofs and a large, unique triangulated tower at the front, the project presented a real challenge. Originally the specification for the 400sq m area called for a metal roof but the cost implications of this meant that another solution was needed, and fast.

It was thought that such a complex roof design could not be done, especially with the time and budget available. However Jonathan Woods, director at Contour Roofing, alongside senior contracts manager, Lee Clift, sought to prove that the roof could indeed be covered using a high quality single ply membrane, if the correct product and level of expertise were applied.

Jonathan and Lee met with the architect and the director of Paul Simon Homes to discuss amending the roofing specification. Jonathan explained: “With our previous experience of Sika Sarnafil products, we knew that we could get the perfect finish within budget. In partnership with Sika Sarnafil we quickly presented a new bespoke specification; an adhered system using Sarnafil G410-15ELF Lead Grey with a polyester fleece backing as the main roof sheet for a flawless result and Sarnafil G410-15EL Lead Grey for all the detail work flashings.”

The installation was very challenging, with various shapes, details, upstands and intricate sections to cover.

Lee added: “Working closely with the carpenter, the plywood deck had to be spot on to make sure the membrane could be laid smartly and correctly. Absolute attention to detail and skill were required to make sure the membrane was flush with the substrate below. Décor profiles were used to imitate the standing seams of a metal roof, which is what the original designs had envisaged.

“The project really took installation to new frontiers and pushed the boundaries of what can be achieved in roofing.”

Sikalastic was used for the guttering when the space was just too tight for single ply, demonstrating the compatibility between Sika’s various roofing products. Both the Sika Sarnafil and Sika Liquid Plastics systems were awarded a 20 year guarantee.

Carly Tan, quantity surveyor, Paul Simon Homes, said: “We didn’t think this project could be done within the budget, but Contour assured us that they could take on the challenge with single ply. No one else would even try.

“The roof is unique and when I saw the end results on a site visit I was really impressed with the finish. The Sika Sarnafil membrane looks very smart and mirror the metal look we originally wanted. The skill of Contour is obvious in the results. It meets our requirements perfectly, matching the luxury feel we wanted to achieve throughout the building.”

The project impressed the judges of the upcoming NFRC UK Roofing Awards and has been shortlisted in the Single Ply category. The winners will be announced in May.

For more information on Sika Sarnafil’s products and services, call 01707 394444, email or visit

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