Technical Booklet E Fire Safety·Page 149·Table 5.4

Permitted unprotected percentages in relation to enclosing rectangles (Method 3) – 21m and 24m high

Table 5.4 specifies the minimum boundary distances required for buildings with enclosing rectangles of 21m and 24m height, based on the width of the enclosing rectangle and the permitted unprotected percentage of the building façade. Figures in brackets apply to Purpose Groups 1, 2, 3, 5 and 7(b); unmarked figures apply to Purpose Groups 4, 6 and 8.

Table 5.4 Permitted unprotected percentages in relation to enclosing rectangles (Method 3) (cont'd) Width of enclosing rectangle (m) Distance from relevant boundary for unprotected percentage not exceeding 20% 30% 40% 50% 60% 70% 80% 90% 100% Minimum boundary distance (m) – figures in brackets are for Purpose Groups 1, 2, 3, 5 and 7(b) Enclosing rectangle 21 m high 3 2.0(1.0) 3.0(1.5) 3.5(2.0) 4.5(2.5) 5.0(3.0) 5.5(3.0) 6.0(3.5) 6.5(4.0) 7.0(4.5) 6 3.5(1.5) 5.0(2.5) 6.0(3.5) 7.0(4.0) 8.0(5.0) 9.0(5.5) 9.5(6.0) 10.0(6.5) 10.5(7.0) 9 4.5(2.0) 6.5(3.5) 7.5(4.5) 9.0(5.5) 10.0(6.5) 11.0(7.0) 12.0(7.5) 13.0(8.5) 13.5(9.0) 12 5.5(2.5) 7.5(4.0) 9.0(5.5) 10.5(6.5) 12.0(7.5) 13.0(8.5) 14.0(9.0) 15.0(10.0) 16.0(10.5) 15 6.5(2.5) 8.5(5.0) 10.5(6.5) 12.0(7.5) 13.5(8.5) 14.5(9.5) 16.0(10.5) 16.5(11.0) 17.5(12.0) 18 7.0(3.0) 9.5(5.5) 11.5(7.0) 13.0(8.0) 14.5(9.5) 16.0(10.5) 17.0(11.5) 18.0(12.5) 19.5(13.0) 21 7.5(3.0) 10.0(6.0) 12.5(7.5) 14.0(9.0) 15.5(10.0) 17.0(11.0) 18.5(12.5) 20.0(13.5) 21.0(14.0) 24 8.0(3.5) 10.5(6.0) 13.0(8.0) 15.0(9.5) 16.5(10.5) 18.0(12.0) 20.0(13.0) 21.0(14.0) 22.0(15.0) 27 8.5(3.5) 11.5(6.5) 14.0(8.5) 16.0(10.0) 18.0(11.5) 19.0(13.0) 21.0(14.0) 22.5(15.0) 23.5(16.0) 30 9.0(4.0) 12.0(7.0) 14.5(9.0) 16.5(10.5) 18.5(12.0) 20.5(13.0) 22.0(14.5) 23.5(16.0) 25.0(16.5) 40 10.0(4.5) 13.5(7.5) 16.5(10.0) 19.0(12.0) 21.5(13.5) 23.0(15.0) 25.5(16.5) 27.0(18.0) 28.5(19.0) 50 11.0(4.5) 14.5(8.0) 18.0(11.0) 21.0(13.0) 23.5(14.5) 25.5(16.5) 28.0(18.0) 30.0(20.0) 31.5(21.0) 60 11.5(4.5) 15.5(8.5) 19.5(11.5) 22.5(13.5) 25.5(15.5) 28.0(17.5) 30.5(19.5) 32.5(21.0) 33.5(22.5) 80 12.0(4.5) 17.0(8.5) 21.0(12.0) 25.0(14.5) 28.5(17.0) 31.5(19.0) 34.0(21.0) 36.5(23.5) 38.5(25.0) 100 12.0(4.5) 18.0(9.0) 22.5(12.0) 27.0(15.5) 31.0(18.0) 34.5(20.5) 37.0(22.5) 40.0(25.0) 42.0(27.0) 120 12.0(4.5) 18.5(9.0) 23.5(12.0) 28.5(16.0) 32.5(18.5) 36.5(21.5) 39.5(23.5) 43.0(26.5) 45.5(28.5) No limit 12.0(4.5) 19.0(9.0) 25.0(12.0) 29.5(16.0) 34.5(19.0) 38.0(22.0) 41.5(25.0) 45.5(26.5) 48.0(29.5) Enclosing rectangle 24 m high 3 2.0(1.0) 3.0(1.5) 3.5(2.0) 4.5(2.5) 5.0(3.0) 5.5(3.5) 6.0(3.5) 7.0(4.0) 7.5(4.5) 6 3.5(1.5) 5.0(2.5) 6.0(3.5) 7.0(4.5) 8.5(5.0) 9.5(5.5) 10.0(6.0) 10.5(7.0) 11.0(7.0) 9 5.0(2.0) 6.5(3.5) 8.0(5.0) 9.5(5.5) 11.0(6.5) 12.0(7.5) 13.0(8.0) 13.5(9.0) 14.5(9.5) 12 6.0(2.5) 8.0(4.5) 9.5(6.0) 11.5(7.0) 12.5(8.0) 14.0(8.5) 15.0(9.5) 16.0(10.5) 16.5(11.5) 15 6.5(3.0) 9.0(5.0) 11.0(6.5) 13.0(8.0) 14.5(9.0) 15.5(10.0) 17.0(11.0) 18.0(12.0) 19.0(13.0) 18 7.5(3.0) 10.0(5.5) 12.0(7.5) 14.0(8.5) 15.5(10.0) 16.5(11.0) 18.5(12.0) 19.5(13.0) 20.5(14.0) 21 8.0(3.5) 10.5(6.0) 13.0(8.0) 15.0(9.5) 16.5(10.5) 18.0(12.0) 20.0(13.0) 21.0(14.0) 22.0(15.0) 24 8.5(3.5) 11.5(6.5) 14.0(8.5) 16.0(10.0) 18.0(11.5) 19.5(12.5) 21.0(14.0) 22.5(15.0) 24.0(16.0) 27 9.0(4.0) 12.5(7.0) 15.0(9.0) 17.0(11.0) 19.0(12.5) 20.5(13.5) 22.5(15.0) 24.0(16.0) 25.5(17.0) 30 9.5(4.0) 13.0(7.5) 15.5(9.5) 18.0(11.5) 20.0(13.0) 21.5(14.0) 23.5(15.5) 25.0(17.0) 26.5(18.0) 40 11.0(4.5) 14.5(8.5) 18.0(11.0) 20.5(13.0) 23.0(14.5) 25.0(16.0) 27.5(18.0) 29.0(19.0) 30.5(20.5) 50 12.0(5.0) 16.0(9.0) 19.5(12.0) 22.5(14.0) 25.5(16.0) 27.5(17.5) 30.0(19.5) 32.0(21.0) 33.5(22.5) 60 12.5(5.0) 17.0(9.5) 21.0(12.5) 24.5(15.0) 27.5(17.0) 30.0(19.0) 32.5(21.0) 35.0(23.0) 36.5(24.5) 80 13.5(5.0) 18.5(10.0) 23.5(13.5) 27.5(16.5) 31.0(18.5) 34.5(21.0) 37.0(23.5) 39.5(25.5) 41.5(27.5) 100 13.5(5.0) 20.0(10.0) 25.0(13.5) 29.5(17.0) 33.5(20.0) 37.0(22.5) 40.0(25.0) 43.0(27.5) 45.5(29.5) 120 13.5(5.5) 20.5(10.0) 26.5(13.5) 31.0(17.5) 36.0(20.5) 39.5(23.5) 43.0(26.5) 46.5(29.0) 49.0(31.0) No limit 13.5(5.5) 21.0(10.0) 27.5(13.5) 32.5(18.0) 37.5(21.0) 42.0(24.0) 45.5(27.5) 49.5(30.0) 52.0(32.5)

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