Correct Answer - Option 4 : 0.5 sqm
Plaster is a thin layer of mortar applied over the masonry surface and it acts as a damp-proof coat over the brick masonry work. Plastering also provides a finished surface over the masonry that is firm and smooth hence it enhances the appearance of the building. Plastering usually 12mm thick is calculated in a square meter.
Deductions related to plastering are as follows:
- No deduction is made for the end of beams, posts, rafters, etc.
- For small opening up to 0.5 m2 area, no deduction in plastering is made.
- For the opening of size 0.5 m2 to 3 m2 area, the deduction is made on one face of the wall.
- For openings of size above 3 m2, the deduction is made on both faces of the wall, but the area of the sill, jamb, and soffits of the opening is added.
There are many other clauses in IS Code such as:
1). If both sides of the wall are plastered with a different mix
2). If only one side of the wall is plastered and the other side is not