Category: Finishes
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Mortar is a mix of cement, sand and water, sometimes with additives, used to lay blocks, plaster and screed. The mix ratio follows the specification for each use; blockwork commonly uses about 1 cement to 4 sand.
Why it matters on a project
Salty or clayey sand and excess water weaken mortar and cause efflorescence and cracks. Factory pre-mixed mortar gives more consistent quality.
Measurement and pricing
Usually not measured on its own but included in the blockwork or plaster rate.
Common mistake
Mixing a large batch in the morning and re-tempering it with water after midday, though it has started to set.
Frequently asked questions
Is pre-mixed mortar better?
More consistent and less wasteful, at a slightly higher cost than site mixing.
Which sand should be used?
Clean sand free from clay and salts, tested if the source is unknown.
Related terms
- BlockworkBuilding walls with solid, hollow or insulated concrete blocks.
- Plaster (render)A cement or gypsum layer applied to walls to level them before paint or cladding.
- Floor screedA thin mortar or concrete layer that levels the floor before tiles or parquet.
- Tile adhesiveA modified cementitious mortar that fixes tiles instead of traditional mortar.
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