2 ply felt material impregnated with bitumen which is also covered in a fine sand to prevent sticking when rolled.Insulates wood from water ingression through wicking.Waterproofing of roofs, flat...
2 ply felt material impregnated with bitumen which is also covered in a fine sand to prevent sticking when rolled.Insulates wood from water ingression through wicking.Waterproofing of roofs, flat...