Press release
April 28, 2021

More space and more revenue with Evonik’s high performance insulation material CALOSTAT®

  • Independent study by Arup proves financial benefits of high-performance insulation material CALOSTAT®
  • Added value through area gain significantly exceeds costs
  • Long service life and sustainability increase the value of buildings

Hanau, Germany. Modern, mineral-based, high-performance insulating materials like CALOSTAT® from Evonik offer an array of technical advantages over traditional materials: they do a much better job of insulating, and they are non-combustible, long-lasting, and recyclable. Their technical performance translates to economic benefits for construction planners and investors.
Working on behalf of Evonik, the international planning and consulting firm Arup took a close look at these benefits and did the math. Their results of the independent study were clear: added value from using CALOSTAT® came in the form of additional space, reduced operating costs, and improved comfort.

Added value through added space
"By using CALOSTAT® from Evonik, investors can gain more usable floor area within the existing space," explains Dr. Bettina Gerharz-Kalte, head of the thermal insulation growth field at Evonik. The London office building in this example was eight stories tall with an area of 20,000 square meters; without increasing the cubic content or changing the external dimensions, the recovered floor space was calculated at 1 percent. In concrete terms, this translates to 210 square meters that can be sold or rented out. Even though use of the high-performance insulating material increased the overall cost of the facade by 10 to 15 percent, the bottom line came to €3 million in additional profits. Rental income will allow the building operator to realize its return on investment (ROI) in just 4-6 years. The variability comes from a number of scenarios based on different underlying assumptions (regarding price development, etc.).

Reduced operating costs
Compared to traditional mineral wool, CALOSTAT® lowers heating demands associated with the facade by an additional 2-4 percent and reduces annual cooling demands by as much as 6-9 percent. The latter is because the insulating power of CALOSTAT® does not depend on temperature—the product performs just as well when outdoor temperatures are high.

Improved comfort
During sun exposure, the product can be expected to reduce interior surface temperatures by approximately 1.5 °C on southern facades and by 0.6-0.7 °C on west facades. Both of these values correspond to a significantly more comfortable environment for users near exterior walls.

Long product life and sustainability
According to Evonik, the insulating material can last for at least 50 years with no loss in performance. “Traditional insulating materials usually have to be replaced within that time, and that's expensive,” points out Tobias Wild-Blatt, an architect and customer advisor for Evonik in Great Britain. For builders, the combination of outstanding insulation performance, non-combustibility, and recyclability that CALOSTAT® offers means more than just efficient insulation—it also allows them to improve the safety and sustainability of a building. Both factors play an increasingly important role in assessing a building. “What we know from many discussions,” Wild-Blatt explains, “is that investors achieve higher sales prices for longer periods of time from buildings constructed according to ecological criteria—because that’s what buyers are paying more attention to.” This is another area where the high-performance insulating material can help investors: its Gold Level Cradle-to-Cradle certification and environmental product declaration with a recycling option will have a positive impact on DGNB (German Sustainable Building Council), LEED, and BREEAM assessments. The fact remains: insulation is a smart investment; mineral-based, high-performance insulating material is an even smarter investment.

Company information

Evonik is one of the world leaders in specialty chemicals. The company is active in more than 100 countries around the world and generated sales of €12.2 billion and an operating profit (adjusted EBITDA) of €1.91 billion in 2020. Evonik goes far beyond chemistry to create innovative, profitable and sustainable solutions for customers. More than 33,000 employees work together for a common purpose: We want to improve life today and tomorrow.


In so far as forecasts or expectations are expressed in this press release or where our statements concern the future, these forecasts, expectations or statements may involve known or unknown risks and uncertainties. Actual results or developments may vary, depending on changes in the operating environment. Neither Evonik Industries AG nor its group companies assume an obligation to update the forecasts, expectations or statements contained in this release.