Trusted by generations of building and construction professionals

Expamet encompasses a wide range of products designed and manufactured in Britain and trusted by generations of construction professionals.

Windpost Quotes
Available Here 

Windposts are designed to offer an alternative, cost-effective method of providing the additional stiffness that a masonry wall requires as specified by the Structural Engineer.

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A wide range of straps, fixings, angles and brackets, wall starters, ties and reinforcement


Arch formers and accessories, plus beads in coated or galvanized metal, stainless steel and uPVC


Masonry Support Design Service

Masonry Support
Design Services 

BAT Masonry Support is a range of bespoke systems designed to carry masonry cladding on steel or concrete structures.

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Thick wall

Vertical construction joints in thick walls over 900mm width, will usually have the Hy-Rib fitted with the ribs horizontally, and supported by vertical timber or aluminium members. The total forces on this wide stop end will be much larger than that on narrow walls. In this orientation, the safe span of the Hy-Rib will be governed by the maximum applied Hy-Rib concrete pressure, which will occur at the bottom of the wall. The maximum clear distance between the vertical supports is determined from the table below. The vertical support members, timber or aluminium, the horizontal twin walings, steel or timber, and the external method of restraining the forces will all need careful design, but because the Hy-Rib concrete pressure will be less than that on conventional impermeable stop ends, the sizes of the members and the magnitudes of the forces will be reduced.

Technical Support

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The properties assume that the Hy-Rib is used with the ribs pointing into the concrete to be placed, and spanning in the strong direction between the supports with the ribs parallel with the span. It is assumed that the Hy-Rib is simply supported. Even if the Hy-Rib is spanning over several supports, its lower bending strength at the support is such that it will yield as the full pressure is applied, making critical the bending at mid-span when analysed as a simply supported member.

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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.