ROCKWOOL delivers versatile flat roof insulation for Cobham Free School

Southern Industrial Roofing has installed over 2,000m² of ROCKWOOL HARDROCK® Multi-Fix Dual Density at the new-build Cobham Free School, Surrey. Meeting a complex warm flat roof specification, ROCKWOOL delivered a non-combustible solution with proven acoustic and thermal performance.

The project had to balance multiple design considerations, starting with BS 6229: ‘Flat roofs with continuously supported flexible waterproof coverings’, and compliance with specific education sector building regulations. While BB93 specified acceptable levels of rain noise transfer into various spaces, BB100 outlined fire protection considerations.

Simultaneously addressing these requirements was compounded by mechanical and electrical plant being housed on the flat roof, which demanded non-combustible zones to provide safe access for maintenance. Internal fire rated walls in the building below also required the flat roof to contribute to effective compartmentation.

As non-combustible stone wool insulation, specifying ROCKWOOL HARDROCK® Multi-Fix Dual Density across the entirety of the flat roof streamlined the installation process. Where the roof deck interfaced with the heads of internal compartment walls, ROCKWOOL Trapezoidal Fire Stops were also installed. To minimise acoustic reverberation and achieve BB93 compliance in the dining room and auditorium, ROCKWOOL Acoustic Infills were friction fitted into the perforated metal deck troughs.

Andy Towns, Designer at Southern Industrial Roofing, explained: “We didn’t have to worry about coordinating zones with different materials – it was ROCKWOOL across the board which simultaneously delivered the acoustic, fire and thermal performance we needed.”

To find out more about how ROCKWOOL supported the flat roof construction at Cobham Free School, please CLICK HERE TO VISIT:

About ROCKWOOL UK

ROCKWOOL Limited is part of the ROCKWOOL Group. With one factory based in Bridgend, South Wales and over 500 employees across the UK, we are the local organisation offering a full range of high-performing and sustainable insulation products for the construction industry.

At the ROCKWOOL Group, we are committed to enriching the lives of everyone who experiences our product solutions. Our expertise is perfectly suited to tackle many of today’s biggest sustainability and development challenges, from energy consumption and noise pollution to fire resilience, water scarcity, and flooding. Our product range reflects the diversity of the world’s needs, while supporting our stakeholders in reducing their own carbon footprint.

Stone wool is a versatile material and forms the basis of all our businesses. With more than 11,000 passionate colleagues in 39 countries, we are the world leader in stone wool solutions, from building insulation to acoustic ceilings, external cladding systems to horticultural solutions, engineered fibres for industrial use to insulation for the process industry and marine & offshore.