Mild steel built-up curbs suitable for mild steel Durbar floor plate trench covers. Curbs are supplied painted in standard oxide primer and can be tapped to receive fixing screws to secure covers if necessary. Mild steel built-up curbing can also be supplied for aluminium P.G.P. plates with the mild steel materials suitably insulated with Bitumen of Neoprene Strip. Standard 3-metre lengths of mild steel built-up type curbing. For long straight runs of trench we supply standard 3-metre lengths. Make-up lengths are provided as necessary and as shown on location drawings. Joints are secured with countersunk bolts to assist Installation. Lugs are welded on at approximately 900mm centres and approximately 150mm from each end.