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Which of the following roof is also known as rafter roof?

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Which of the following roof is also known as rafter roof?

(a) Double roof

(b) Lean-to-roof

(c) Couple-close roof

(d) Couple roof

I got this question in unit test.

I would like to ask this question from Single and Double Roofs topic in portion Roofing Materials of Construction & Building Materials

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Correct answer is (a) Double roof

Easiest explanation: Double roof is also known as rafter roof or purlin roof. Double roofs are used when the span exceeds 5 metres. Purlin is used to tie the rafters together.

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