Roxul’s Milton headquarters achieves LEED Gold certification

Structure incorporates over 80,000 square feet of the company’s own stone wool insulation.

February 23, 2016   by PLANT Staff

Roxul's Milton, Ont. headquarters. PHOTO: ROXUL INC.

Roxul’s Milton, Ont. headquarters. PHOTO: ROXUL INC.

MILTON, Ont. — ROXUL Inc.’s North American headquarters in Milton, Ont. has earned LEED Gold certification in the New Construction category from the Canada Green Building Council (CaGBC), ranking the company’s head office among Ontario’s most energy-efficient new buildings.

According to the CaGBC, “Leadership in Energy and Environmental Design (LEED) is a rating system that is recognized as the international mark of excellence for green building in 150 countries.

LEED certification distinguishes building projects that have demonstrated a commitment to sustainability by meeting standards for design, construction and operation. LEED Gold certification is the second highest attainable level, reflecting best-in-class green building strategies, practices and materials.

It requires a LEED score of 60 to 79 points. ROXUL’s head office received a score of 65.


The company’s headquarters was built with over 86,000 square feet of its own stone wool insulation products, which reduces energy consumption and minimizes the impacts of climate change. It is modelled to use 100 kWh per day of energy, while the average building uses 300 to 400 Kw/m2.

Its open-concept floor plan maximizes natural lighting throughout the entire office and also includes motion-sensor lights and HVAC systems, drought resistant landscaping, rain water harvesting and grey water reuse.

ROXUL’s own Energy Design Centre – a resource and education hub for architects, designers and specifiers­­­­ – was involved in the building’s design and energy modelling to ensure the headquarters would integrate advanced green features to far exceed building code. Thermal couples, relative-humidity sensors and heat-flux meters were installed in the roof, walls and below-grade insulation to monitor the in-situ performance of Roxul’s insulation.

Decibel meters were also installed to measure the variation in sound between the exterior and interior of the building. The data captured is recorded and uploaded to a third-party system. The data will underscore the long-term performance of the building’s green construction and act as a real-time case study and education tool.

Roxul, based in Milton, Ont., is a subsidiary of Rockwool International, the world’s largest producer of stone wool insulation. It has additional production in Byhalia, Miss. and Grand Forks, BC.

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