Proportions
| Cement | 1 part |
|---|---|
| Lime | 1 part |
| Sand | 6 parts |
Render
Render mix ratio for an exterior wall
The standard exterior render undercoat is 1 : 1 : 6 cement : lime : sand — workable, breathable and softer than the coat beneath it.
Recommended mix
1 : 1 : 6cement : lime : sand
Render brown / undercoat.
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
The standard 1:1:6 exterior undercoat — good workability, breathable, and softer than the coat beneath it. Lime improves cohesion and reduces cracking.
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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