Which of the following statements is valid for the general specification of first class building?
1
Damp Proof Course shall be of 2.5 cm thick cement concrete with 5% pudlo by weight of cement or any other specified water proof material.
2
Damp Proof course of 2 cm thick shall be of Portland cement concrete (1 : 2 : 4) with one coat of bitumen laid hot.
3
Interior and exterior surface of the walls shall be cement plastered lime or cement mortar; inside shall be three coats of white wash and outside with one coat of white wash.
4
Interior surface of the walls shall be mud plastered and covered with three coats of white wash, and exterior surface shall be flush lime pointed.