Innovative Rendering by Sto Transforms Oxford Circus Landmark

Sto, in collaboration with applicators Chiltern Contracts, has successfully completed a rendering project that enhances both performance and aesthetics for a refurbished multi-purpose building in central London.

Located in Oxford Circus, Henry Wood House was originally constructed in the 1960s and consists of a 16-storey tower with two interconnecting wings, each five storeys high. The building comprises 69,000 square feet of office space, 10,800 square feet of retail, and a hotel occupying the upper seven floors.

The external renovation required the refurbishment of the existing façade, including the application of new rendering.

Sto was chosen to design a system that would not only repair the damaged façade but also meet a specific design brief from Ben Adams Architects and the building’s owners, Derwent. The brief called for a modern, linear render finish that would bring texture to the building’s surface and provide a durable exterior.

Bogdan Stefan, Project Manager for Chiltern Contracts’ façades division, said: “The linear appearance, which was to be applied across thousands of square metres, was particularly challenging and had not been replicated anywhere else in the UK before.

“Meticulous planning was crucial to achieve the desired result. Sto provided specialist training for our applicators, enabling us to create extensive mock-ups for the client’s approval before commencing the work.”

To create the StoSignature linear appearance, Stolit MP render was applied, and using a special V-shaped trowel, the applicators carefully pulled the trowel in one direction across the render at a specific angle to achieve the exact finish required.

Bogdan continued: “Replicating the precise lines approved in the mock-up on a much larger scale required significant skill and patience. To ensure consistency and the highest standards, the applicators who were specially trained by Sto completed the entire project from start to finish.”

Before applying the specialist render finish, the StoReno Plan system was used to repair the façade. This system was installed over the failing mosaic tile cladding and granite slips. It comprised an adhesive bedding coat, StoReno A recycled glass, mesh-reinforced carrier boards, a reinforcing coat with embedded mesh, and the decorative render finish. This system ensures the new façade is resistant to cracking and weathering. The new repair system was specifically selected for installations requiring an A2-s1, d0 reaction to fire classification.

Given the complexity of the installation, Sto provided ongoing technical advice and support to the applicators throughout the project. Due to the building’s existing structure and high negative wind loads, strict fixing patterns had to be agreed upon and followed. The installation was reviewed by Sto at various stages to ensure the workmanship met the required standards, securing an extended warranty.

The rendering project was completed on time and met the high expectations of all parties involved.

For more information, visit www.sto.co.uk, email info.uk@sto.com, or call 0330 024 2666.