Bitumen-impregnated cellulose fibre is a pre-finished sheet product used in both wall and roof claddings.

Impact damage

Replace damaged sheets.

Erosion of the coating

This is normally due to weathering. Check if the coating is still under warranty. If not, repaint to the manufacturer’s specifications, using a bitumen-compatible water-based paint.

Moss and mould growth

This is caused by moisture buildup.

Treat with water-based chemical treatments only. Consult suppliers of roof and wall cleaning materials for suitable products.