Tower scaffolds are widely used, but they are involved in numerous accidents each year and are inappropriate for most bat work. Obtain a copy of HSE Construction Information Sheet No. 10 (Rev) (available at http://www.hse.gov.uk) and follow the instructions set out in the sheet. 2.3.3 Access to roofs If you are considering access onto a roof at any stage, you should bear in mind that in the construction industry falls from and through roofs cause more deaths than almost anything else. Access to single storey flat roofs, such as garages or house extensions needs only basic care at the edge, but access to any other sort of roof needs a careful assessment of the risks involved and the provision of appropriate safety equipment. Access to roofs should not be required for most bat work and must not be attempted unless you have the training and specialist knowledge to do so safely. The roofs of many industrial and farm building are made out of corrugated cement sheet. These are fragile and brittle and must not be walked on without crawl boards.