For brickwork, no deduction is made for area of opening up to

Explanation:

Rules for the deduction for openings as per IS - 1200 for brickwork:

No deduction is made for the following:

i) Bearing of floor and roof slabs are not deducted from the masonry in the superstructure. 

ii) Opening up to 0.1 m2

iii) Ends of the beam, posts, rafters, purlin, etc. chajjas where thickness does not exceeds 10 cm.

iv) Bed plates, wall plates, bearing of chajjas where thickness does not exceed 10 cm. 

Deduction in plastering are made in the following manner:

i) No deduction is made for ends of beams, posts, rafters, purlin, etc.

ii) No deduction is made for opening up to 0.5 m2 and no addition is made for jambs, soffits, and sills of these openings. 

iii) For opening more than 0.5 m2 and up to 3 m2 the deduction is made for one face only. No addition for jambs, soffits, and sills of these openings.

iv) For opening above 3 m2 the deduction is made for both faces of openings and the jambs, soffits, and sills shall be added.