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_________ stairs are light in weight, they are mostly used for residential buildings.

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_________ stairs are light in weight, they are mostly used for residential buildings.

(a) Timber

(b) Stone

(c) Marble

(d) Cantilever

I got this question during an online interview.

I would like to ask this question from Stairs of Different Materials in portion Arches, Lintels, Stairs and Formwork of Construction & Building Materials

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The correct answer is (a) Timber

Easy explanation: The main objective of the provision to a wooden stair is that it is easily attacked by fire and thus, in case of a fire, the occupants of upper floor cannot escape. But if a wooden stair is constructed from good quality Timber such as teak and if it’s thickness is about 45 mm it becomes sufficiently fireproof.

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