From durability point of view, the grade of masonry mortar to be used for a given work is primarily dependent upon the following two factors.
Loading condition
Exposure condition
masonry mortar
Considering the above two factors the suitable grade of masonry
mortar to be used for different works is given in the following table.
Generally cement mortar is used for most of the cases, therefore
corresponding to the grade, proportion of cement mortar (i.e. cement to
sand ratio) is also shown in the below table for a quick reference.
Type of Work vs Grade of Masonry
Type of Work
Grade of Masonry Mortar
Corresponding Cement : Sand ratio
Masonry exposed to rain but protected by plaster
MM 0.7 (minimum),
MM 2 (preferable)
1.:8 to 1:7
Masonry exposed to rain but not protected by plaster
MM 2 (minimum)
1:7
Load bearing wall
MM 0.5 (minimum),
MM 0.7 (preferable)
1:8
For foundation work laid below damp proof course
(Soil having little moisture)
MM 0.7 (minimum)
1:8
For foundation work laid below damp proof course
(Very damp soil)
MM 0.7 (minimum),
MM 2 (preferable)
1:8 to 1:7
For foundation work laid below damp proof course
(Saturated soil)
MM 2 (minimum)
MM 3 (preferable)
1:7 to 1:6
Building subject to vibration of machine
MM 3 (minimum)
1:6
For parapet wall (where height is greater than thrice the thickness)
MM 3 (minimum)
1:6
For parapet wall (where height is less than thrice the thickness)
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