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Which of the following is the correct formula for finding gauge in slate roofing?

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Which of the following is the correct formula for finding gauge in slate roofing?

(a) Gauge = (length of slate – lap)/2

(b) Gauge = (lap – length of slate)/2

(c) Gauge = (length of slate – lap)/4

(d) Gauge = (lap – length of slate)/4

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Asked question is from Roof Coverings for Pitched Roofs topic in chapter Roofing Materials of Construction & Building Materials

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Correct answer is (a) Gauge = (length of slate – lap)/2

Best explanation: In slate roofing, the slates are fixed to the battens. The spacing of these battens is known as gauge. Gauge is calculated by using the formula – Gauge = (length of slate – lap)/2.

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