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In jack arch floors, the rise of the arch is equal to ________ of the span.

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In jack arch floors, the rise of the arch is equal to ________ of the span.

(a) 1/3

(b) 1/4

(c) 1/6

(d) 1/12

This question was addressed to me in examination.

My question is taken from Types of Upper Floors topic in portion Floors and Flooring of Construction & Building Materials

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The correct option is (d) 1/12

The best explanation: In jack arch floors, the rise of the arch is equal to 1/12 of the span. Jack arch is an arch made of either concrete or brick. In this, the spacing between the joists is 1-1.5 m placed center to center.

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