RPM International has agreed to acquire Kalzip, a German supplier of aluminium roofing and façade systems. The deal adds to RPM’s building envelope business and supports demand for lighter construction materials. The RPM Kalzip acquisition also deepens the company’s focus on specification-led construction projects.
RPM said that Kalzip will become part of its Tremco Construction Products Group. The company expects the deal to strengthen Tremco’s aluminium system offering. Operations in Europe and India will continue. North America is expected to become a new growth area.
Kalzip is based in Koblenz, Germany. It supplies aluminium systems used in complex buildings. Its products have been used at Barcelona’s El Prat Airport, Berlin’s Mercedes-Benz Arena, and the Ikea project in Dubai. Kalzip reported net sales of EUR 75 million, or about USD 82 million, in 2024.
The merger with Tremco CPG is aimed at broadening RPM’s building envelope portfolio. This encompasses roofing refurbishment, sealants, waterproofing and external insulation. RPM also sees an opportunity to widen its systems portfolio into new markets through the RPM Kalzip Acquisition.
The transaction is expected to close by the end of RPM’s 2026 fiscal year. Kalzip’s senior management team will continue to run the business after the deal closes.
RPM chairman and chief executive Frank C. Sullivan said the acquisition fits well with projects that rely on technical specifications. He cited Kalzip’s experience in system design and performance. The deal reflects a wider move toward lighter materials and integrated envelope systems, as developers focus on durability and long-term building performance.