You are installing hurricane straps on a roof in Hawaii. The building is 28 ft wide and trusses are spaced 24 inches on center. How many hurricane straps are required for one side of the roof?
Correct Answer
C) 15
Number of spaces = 28 ft ÷ 2 ft = 14 spaces. Number of trusses = 14 + 1 = 15 trusses requiring hurricane straps.
Why This Is the Correct Answer
Number of spaces between trusses = total width ÷ spacing = 28 ft ÷ 2 ft = 14 spaces. Number of trusses = number of spaces + 1 = 14 + 1 = 15. Each truss requires a hurricane strap on each side of the roof where it bears on the wall plate, so 15 straps are needed for one side.
Why the Other Options Are Wrong
Option A: 13
13 straps would result from subtracting 1 from 14 spaces instead of adding 1. This reflects a misapplication of the 'posts = spaces + 1' counting rule — the candidate may have subtracted instead of added.
Option B: 14
14 straps equals only the number of spaces, not the number of trusses. This is the most common off-by-one error: forgetting to add the final truss at the end of the run.
Option D: 16
16 straps would result from rounding up incorrectly or adding 2 instead of 1. There is no basis for 16 in the standard spacing calculation for a 28-foot building.
Memory Technique
Use the fence post analogy: Spaces = Width ÷ Spacing; Members = Spaces + 1. '28 ft ÷ 2 ft = 14 spaces → 14 + 1 = 15 trusses = 15 straps.'
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