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The Dunes

2 mins

Situated just 10 short metres from the beach at Perranporth in Cornwall, Progressive Systems had to contend with unforgiving coastal weather to deliver an attractive, yet robust roof to this luxury development.

the dunes

The Dunes, made up of 36 luxury beachfront properties, features unobstructed views to the Atlantic Ocean and is set amongst three miles of golden sands. The roofing system needed to be able to withstand the difficult coastal conditions and guarantee a long-lasting solution. The project also required waterproofing across a combination of different balconies with complex details. Both the roof and balconies had to be completed to a high standard, while also matching the luxury aesthetic of the build.

the dunes roof complexity


One of the most prominent design features on the roof was Sarnafil Decor Profiles, which was used on the steeper pitched roofs to mimic a standing seam roof. The team specified Sika Sarnafil S327 18 EL Lead Grey single ply membrane, and wind uplift calculations provided by Sika Sarnafil suggested the product should be mechanically fixed to ensure the roof could resist the formidable weather. The windy conditions together with the pitched roof presented an installation challenge for the team.

However, Progressive Systems worked closely with Sika Sarnafil and main contractor Acorn Blue to deliver a roofing system robust enough to endure the demanding weather, while providing a look to match the prestigious coastal location.


Progressive Systems usually use a polyethylene-based vapour control layer as part of the build-up, however, the team specified Sarnavap 5000E SA, a multi-layer self-adhesive vapour control layer to improve the efficiency of installation in the tough weather conditions. Due to its high adhesion strength, it was able to withstand high wind loads, leaving the client with a robust, high-quality roof suitable for its wet and windy location.


Sika Sarnafil S327 18 EL Lead Grey single-ply membrane; Sarnafil Decor Profiles, Sarnavap 5000E SA vapour control layer; Sarnartherm insulation.

At a glance

  • Project: The Dunes
  • Roofing Awards 2019 winner: Single Ply
  • Location: Perranporth
  • Roof Covering: Single Ply
  • Client / Developer: Acorn Blue Property
  • Architect: Stride Treglown
  • Roofing Contractor: Progressive Systems
  • Supplier: Sika
  • Award Sponsor: EJOT

About Progressive Systems

Established in 1988, Progressive Systems Ltd has become a leading contractor of roofing and cladding systems and their associated fabrications in the South West. The company specialises in single ply, green roofs, flat roofs, waterproofing and sheeting and cladding.

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