The volume of dry mortar required for pointing depends upon the type of surface i.e. either brick work or masonry work.
For pointing ( which may be flush, struck or keyed) to the brick work, the dry volume of mortar , including wastage, required for 10 sq.m area is about 0.036 cum. and for random rubble masonry it is 0.076 cum.
Thus knowing the proportion of the mix of the mortar as 1:3, the quantity of cement and sand can be found out as follows:
- For pointing to brick work
Volume of cement required = 0.036 / (1+4) = 0.009 cum.
= 0.009 x 30 = 0.270 bags
and, Volume of sand required = [0.036 / (1+3)] x 3 = 0.027 cum.
- For pointing to random or coursed rubble masonry, the volume of dry mortar required = 0.076 cum.
Therefore, For pointing in cement mortar (1:3) proportion,
Quantity of cement required = 0.076 / (1+3) = 0.019 cum.
= 0.019 x 30 = 0.57 bags = 0.60 bags of cement
and, Quantity of mortar required = [0.076 / (1+3)] x 3 = 0.057 cum.
Basics for Site Engineer 