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For first class building D.P.C. shall be __________ thick cement concrete 1:1 1/2:3.

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For first class building D.P.C.  shall be __________ thick cement concrete 1:1 1/2:3.

(a) 10.5 cm

(b) 2.5 cm

(c) 5.5 cm

(d) 0.5 cm

I have been asked this question in a national level competition.

This question is from General Specifications topic in section Specifications, Estimation of Quantities of Materials and Transport of Civil Engineering Drawing

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Correct choice is (b) 2.5 cm

To explain: D.P.C.  shall be 2.5 cm (1”) thick cement concrete 1:1 1/2:3, mixed with one kg of impermo per bag of cement or other standard water proofing materials as specified and painted with two coats of bitumen.

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