The Birtley Cavity Wall Lintel 3000 x 290mm (L x W) Galvanised is manufactured from mild steel, very strong due to the low amount of carbon. It has a density of 248 pounds per cubic inch. This is used‚ in construction because of its ductility and malleability. It is sued with a cavity tray on external walls. The cavity wall reduces the weights on the foundation and gives better thermal insulation. This does not allow the moisture content to enter because of the hollow space between leaves. It co

Brand Name	Birtley