Structure: Approved Document A

O N L I N E V E R S I O N A1/2 THICKNESS OF WALLS IN CERTAIN SMALL BUILDINGS Diagram 4 Parapet walls: height See para 2C11 except for a wall in the lowest storey of a three 2C14 Maximum floor area: The guidance of storey building, carrying load from both upper this section assumes that no floor enclosed by storeys, which should have a thickness as structural walls on all sides exceeds 70m2, and determined by the equation or 140mm whichever that no floor without a structural wall on one side is the greatest. exceeds 36m2. (See Diagram 5.) 2C11 Parapet walls: The minimum thickness 2C15 Imposed loads on roofs, floors and and maximum height of parapet walls should be ceilings: The design considerations given in as given in Diagram 4. this section are intended to be adequate for the imposed loads given in Table 4. 2C12 Single leaves of certain external walls: The single leaf of external walls of small single- 2C16 Maximum height of buildings: The design storey non-residential buildings and of annexes guidance in this section is based on BS EN need be only 90mm thick, notwithstanding 1991-1-4:2005 with its UK National Annex. The paragraphs 2C38. maximum heights of buildings given in Table c of Diagram 7 correlate to various site exposure 2C13 Modular bricks and blocks: Where walls conditions and wind speeds. A map showing are constructed of bricks or blocks having wind speeds is given in Figure 1 of Diagram 6. modular dimensions, wall thicknesses prescribed in this section which derive from a dimension of Conditions relating to the wall brick or block may be reduced by an amount not exceeding the deviation from work size permitted 2C17 Maximum allowable length and height by a British Standard relating to equivalent sized of the wall: This section does not deal with walls bricks or blocks made of the same material. longer than 12m, measured from centre to centre of buttressing walls, piers or chimneys providing restraint, or with walls exceeding 12m in height (see also Table 3). Approved Document A Structure O N L I N E V E R S I O N 17