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Figure shown below represents ________(a) Barrel roof(b) Dutch gable, gablet(c) Saw-tooth roof(d) Butterfly roofThe question was posed to me in an online interview.My enquiry is from Roof Covering, Sloping Roof & Flat Terraced Roof topic in chapter Rules and Methods of Measurement of Civil Engineering Drawing

Answer»

Right choice is (d) Butterfly ROOF

Easiest explanation: A butterfly roof (sometimes called a V roof or London roof) is a form of roof characterized by an inversion of a standard roof form, with two roof surfaces sloping down from OPPOSING edges to a valley near the MIDDLE of the roof. It is so called because its shape resembles a butterfly’s wings. Butterfly roofs are commonly associated with mid-century modern architecture. The form has no gutter as RAINWATER can run off the roof in no more than two locations, at either END of the valley, often into a scupper or downspout. The form may be symmetrical, with the valley located in the center, or asymmetrical with an off-center valley.



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