Differences in ground level - diagram and requirements

Diagram 4C.9 Differences in ground level a) examples of ground level differences b) maximum permitted differences in ground level Notes: 1 Floor slabs in fig (b) have been omitted for clarity and may be on either side of the walls shown. 2 Cavity walls should be tied in accordance with Table 4C.5. 3 These recommendations apply only to circumstances where there is a full storey height of masonry above the upper retained level. Ground supported floor slab: combined dead and imposed load W should not exceed 70 kN/m at base of wall; H should be less than or equal to 1 m and less than or equal to 4T Suspended ground floor: suspended ground floor to be level for a distance of not less than 1.25H; H should be less than or equal to 1 m and less than or equal to 4T Concrete fill to wall cavity: H should be less than or equal to 1 m and less than or equal to 4(T1 + T2); see para 4C.17