Malthoid is a 2-ply felt material impregnated with bitumen, which is also covered in a fine sand to prevent sticking when rolled.
Often used as a slip joint in non-load-bearing brickwork work, but not designed for this use.
Designed to stop water ingress into building structures.
Primarily used to prevent condensation, rising damp in brickwork.
Also used for waterproofing of roofs.
Comes in 20m rolls.
Widths available include 110mm,150mm,230mm, and 300mm.