Proportions
| Cement | 1 part |
|---|---|
| Lime | 0.5 parts |
| Sand | 4.5 parts |
Render
Stucco mix ratio for the scratch coat
The stucco scratch (first) coat is a strong 1 : ½ : 4½ mix, scratched to key the brown coat that follows.
Recommended mix
1 : 0.5 : 4.5cement : lime : sand
Render scratch (first) coat.
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 strong first coat, keyed (scratched) to bond the next coat. Slightly richer than the undercoat above it so shrinkage stresses point inward.
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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