Proportions
| Portland cement | 1 part |
|---|---|
| Hydrated lime | 2 parts |
| Sand | 9 parts |
| Typical strength | 350 psi · 2.4 MPa |
Mortar
Mortar mix ratio for repointing
Repointing older, soft masonry uses a weak, lime-rich Type O mortar so the joints, not the bricks, take any future movement.
Recommended mix
1 : 2 : 9portland cement : hydrated lime : sand
Type O mortar — about 350 psi (2.4 MPa).
Planning reference. Typical proportions and strength for general work, not a structural mix design. Load-bearing and structural work must follow your local building code and a qualified engineer's specification.
Why this mix
A low-strength mortar (min 350 psi) for interior non-load-bearing walls and for re-pointing soft historic brick where a hard mortar would cause damage.
Once you know the mix, the volume calculators tell you how much of it to buy — cubic yards, cubic metres and the bag count in every size.
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