Trusted by generations of building and construction professionals
EXPAMET
ESTABLISHED QUALITY 

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

Windpost Quotes
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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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BUILDERS METALWORK
BUILDING INDUSTRY EXPERTISE SINCE 1889

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

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PLASTERERS ACCESSORIES
BUILDING INDUSTRY EXPERTISE SINCE 1889

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

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Masonry Support Design Service

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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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Slab Stopend – Construction Joints

Indicative clear distance between supports at slab joints

Overall depth of slab joint Max.Concrete Pressure Clear distances between the Hy-Rib supports
Theoretical *
Table2
CIRIA 108
assummed
for Hy-Rib
Grade
2411
Grade
2611
Grade
2811
mm  kN/m²  kN/m²  mm  mm  mm
250  6.25 3.20 1250 1025 950
500 12.50 6.30 900 725 675
750 18.75 9.50 725 600 550
1000 25.00 12.70 625 500 475
1250 31.25 15.80 575 450 425
1500 37.50 19.00 525 425 400
2000 50.00 25.30 450 375 350
2500 62.50 31.70 400 325 300
3000 75.00 38.00 375 300 275

 

Technical Support

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NOTES

The Hy-Rib is used in horizontal sheets with the ribs pointing into the concrete to be placed, and spanning in the strong direction between vertical supports. * The theoretical maximum pressure is that calculated using Table 2 in CIRIA Report 108 (Ref. 2) with a concrete density of 25 kN/m3, for EITHER a wall, a base or a column; AND applies to concrete Groups 1 to 5 inclusive. The Hy-Rib pressure diagram up to 3m in height of joint is assumed to be triangular – refer to Technical Information – Assumed Concrete Pressure Data. The permissible spans calculated from an uniformly applied concrete have been increased by a factor of 1.2 to allow for the triangular shape of the concrete pressure diagram. The maximum pressure only applies at the very bottom of the slab joint.

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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.