Percy Street

This project was a commission to manufacture and design a roof structure for a building extension in London. 

The hexagonal roof structure was created from British grown oak glulam, supplied by UK Hardwoods, and was designed to both support a terrace above and create a feature of the glazed unit for the room below. 

The most challenging part of the design was the three-way moment node joints used to create the honeycomb effect. The joints had high forces and had to be carried through the existing building in pieces so the challenge was a design that would take the force, but was also practical and even possible to assemble in a tight space. 

Once the roof was in place, the client added their choice of fire finish to the glulam to ensure the finished product was suitable for commercial use. 

Specification

• Project: Percy Street, London 

• Commission: Hexagonal roof structure 

• Architect: Spparc Studio 

• Main Contractor: Stanway Interiors, G-Frame  

• Engineer: Mason Navarro Pledge   

• Timber: British grown oak glulam supplied by UK Hardwoods 

• Fixings: concealed dowels and flitch plates 

• Finish: fire varnish 

• Cost (approx & 2022): £2,000 per square metre – design, manufacture and supply