Different ratio of cement is used for mortar for outside plaster is based on following criteria;
|Mix Ratio of Mortar||General Usage Recommended|
|1:3||Very rich mortar mix. Not recommended for general usage at sites. Can act as a repair mortar with a waterproofing/bonding agent|
|1:4||For External Plaster and for ceiling plaster|
|1:5||Brickwork Mortar and for Internal plaster (If sand is not fine Fineness Modulas > 3)|
|1:6||For Internal Plaster (if fine sand is available)|
We can calculate mix ratio of cement mortar with the help of below YouTube video.
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