Access to and use of buildings: Approved Document M

O N L I N E V E R S I O N M1/M2 ACCESS TO BUILDINGS OTHER THAN DWELLINGS Diagram 4 Stepped access – key dimensions and use of hazard warning surface d. where there is side access onto an g. there are no single steps; intermediate landing, a ‘corduroy’ h. the rise of a flight between landings hazard warning surface 400mm deep contains no more than 12 risers for a is provided either on the intermediate going of less than 350mm and no more landing 400mm from both upper and than 18 risers for a going of 350mm or lower flights, if there is sufficient space greater (see Diagram 5); to accommodate the surface outside the line of the side access, or within the i. all nosings are made apparent by side access 400mm from the intermediate means of a permanently contrasting landing if there is a continuous handrail material 55mm wide on both the tread opposite the side access; and the riser; e. no doors swing across landings; j. the projection of a step nosing over the tread below is avoided but, if necessary, f. it has flights whose surface width not more than 25mm (see Diagram 6); between enclosing walls, strings or upstands is not less than 1.2m; Approved Document M Volume 2 Access to and use of buildings other than dwellings O N L I N E V E R S I O N 21