Breaking M&A news from the UK fenestration sector as it has been announced that Thermoseal have been acquired by Milan-based Fenzi Spa Group for an undisclosed sum. Here is the press release published by Thermoseal announcing the acquisition:

Thermoseal Group has been acquired by Fenzi Group Spa (Fenzi), a Milan-based chemical company specialising in glass processing solutions, in a deal that marks a significant milestone for both companies, and promises to open up new opportunities for customers of both companies.

Fenzi has agreed to buy a 100% shareholding in Thermoseal Group for an undisclosed amount, which includes manufacturing and warehousing facilities in Birmingham and Wigan. Previous owner Gwain Paterson will remain as Managing Director, and Mark Hickox will continue as Sales Director.

Gwain Paterson

“We are pleased to announce this exciting news, which is an ideal fit to help with our aspirations to become a true global player in the IG components market with our performance-leading Thermoflex and Thermobar warm edge spacer systems,” Gwain said.

“We are delighted to work with the Fenzi team in the next phase of our company’s growth, and apart from new owners everything remains the same. We have well-established supply chains and we look forward to continued business with our long-standing customers.”

Alessandro Fenzi, CEO of Fenzi Group, said: “We welcome Thermoseal to the Fenzi family. Their expertise in IG solutions, particularly the innovative Thermoflex flexible spacer product, complements our global growth strategy.”

The acquisition underscores Fenzi’s dedication to fostering collaboration, innovation, and excellence within the glass industry, and the acquisition will allow Fenzi Group to expand Thermoflex and Thermobar sales internationally.

Thermoseal Group manufactures Thermoflex at its site in Wigan using the very latest compounding, extruding and processing machinery, alongside Thermobar rigid spacer bar.

All components supplied by Thermoseal Group, including desiccant, sealant and injection moulded fittings, are extensively tested to ensure that the insulated glass units exceed the expected lifespan of the windows they are used in.

Thermoseal Group also has a rapidly expanding export division, which will benefit from the increased investment promised by the acquisition by Fenzi.

For more information, please visit, or call 0121 331 3955.

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