Workmanship

Standard lead pencils contain graphite and must not be used on AZ-coated steel tiles, as graphite can cause premature corrosion failure of the coating. 

Tile cuts and bends must leave straight lines up the roof section to provide a true line for flashings.

When cutting tiles for their installation at ridges, hips, valleys and barges, avoid damage to the surface finish by using a guillotine or metal shears. When cutting the tile lengthwise, it must be bent before cutting to reduce the amount of distortion that occurs as the profile is flattened during bending.

Tiles turned up and down for ridges, hips, barges, eaves, and valleys must be bent using a bender specifically designed for this purpose. Tiles must be turned up at ridges, hips and barges by a minimum of 40 mm, and down into the valleys to a minimum of 5 mm from the valley floor.