Galvanizing and metal finishing services



Kings Barton will be a sustainable new suburb to the North of Winchester. the development is a mix of apartments and two to five bedroom houses.


Kings Barton, Andover Road, Winchester


CALA Homes needed to achieve PART L requirements on plots throughout the development


  • PSI Value calculations and full support was provided by Birtley’s technical division
  • Greatly diminished thermal bridging across Supatherm specified plots
  • Supatherm is a fully galvanized lintel, no need for the use of two different materials
  • CALA Homes found Supatherm easy to implement
  • provided good quality against cost compared with previous suppliers

“When the group deal was set with Birtley the transition was effortless and by using Supatherm we have met the requirements our business needed. I would recommend the use of Birtley’s Supatherm lintel as a cost effective alternative, as these meet the U Values when trying to achieve SAP calculations in the first instance”

Darren Hill

Senior Buyer, CALA Homes

PSI Value Calculator

Part of the Birtley Group

Birtley began life as Birtley Building Products in 1965, based at the current site in County Durham. Originally a steel fabricator for the area’s mining and power generation industries, the company made its first steel lintels in 1967. Since then, Birtley has grown from reliable local supplier to a UK-wide force in construction design technology and product development.

In 1889, the British Metal Expansion Company was established in Hartlepool. It had sole European rights for the manufacture of expanded metal mesh, mainly for use as reinforcement and lath in the rapidly expanding sector of concrete construction. The business that grew from these early days later changed its name to Expamet.

Acquired by Birtley Group in 2015, Bowater Doors is a nationally-known name synonymous with top quality and imaginative composite residential door design and manufacture.

The product portfolio offers exclusive ranges for trade installers and a retail range providing doors direct to consumer and social housing organisations.

Birtley Galvanizing boasts one of the most impressive galvanizing plants in Europe. The plant achieves the finest quality hot-dip galvanized zinc protective coatings to BS EN ISO 1461. Using state-of-the-art technology the plant processes steel products using a computer controlled, automated handling system, enabling Birtley Galvanizing to provide full project solutions to many industries.