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 5 Maximum floor area enclosed by structural walls See para 2C14 2C20 Masonry units: Walls should be properly Table 4 I mposed loads bonded and solidly put together with mortar and constructed of masonry units conforming to: Element Loading a. clay bricks or blocks to BS EN 771-1; Distributed loads Roof 1.00kN/m² for spans not exceeding 12m b. calcium silicate bricks or blocks to BS EN 1.5kN/m² for spans not exceeding 6m 771-2; Floors Distributed load: 2.00kN/m² c. concrete bricks or blocks to BS EN 771-3 or BS EN 771-4; Ceilings Distributed load: 0.25kN/m² together with concentrated load: 0.9kN d. manufactured stone to BS EN 771-5; e. square dressed natural stone to the 2C18 Rules of measurement for heights of appropriate requirements described in walls and storeys: The height of a wall or a BS EN 771-6. storey should be measured in accordance with 2C21 Compressive strength of masonry units: the rules in Diagram 8. Minimum compressive strength requirements Construction materials and for masonry units according to BS EN Standards are given in Diagram 9, where the masonry units workmanship indicated for Conditions A, B and C should have declared compressive strengths of not 2C19 Wall ties: Wall ties should comply with less than the values given in Table 6. Normalised BS EN 845-1 and should be material references compressive strengths for block sized clay and 1 or 3 in BS EN 845-1 Table A1 austenitic stainless calcium silicate masonry units not complying with steel. Wall ties should be selected in accordance brick dimensional format are given in Table 7. with Table 5 of this Approved Document. Continued on page 25 Structure Approved Document A 18 O N L I N E V E R S I O N