The centre-line method for computing masonry quantities uses the total centre-line length L_c, where for a rectangular building with outer dimensions L x B and wall thickness t:
Choose the correct answer
L_c = 2(L + B)
L_c = 2(L + B) - 4t (deduct 4 corner allowances of t each)
L_c = L + B
L_c = 2(L + B) + 4t
Correct Answer
B. L_c = 2(L + B) - 4t (deduct 4 corner allowances of t each)
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Centre-line method: L_c = 2(L + B) - 4t, where the deduction 4t removes double-counting at the 4 corners (each corner is counted in both walls; deduct t at each corner for both walls = 4 deductions of t). Masonry volume = L_c x H x t. Quick method for simple buildings.
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