The weakest and most workable coat, applied thin. Being softer than the undercoat, it accommodates movement without pulling the wall apart.
Mix ratio
1 : 2 : 9
Cement : Lime : Sand
Proportions & strength
Render / stucco finish coat: proportions by volume, typical compressive strength and use.
Designation
Finish coat
Ratio (by volume)
1 : 2 : 9
Cement
1 part
Lime
2 parts
Sand
9 parts
Typical use
Final thin finish / stucco top coat.
Planning reference. Strengths are typical values for a well-made mix at 28 days, not a guaranteed design strength. Structural work must follow your local building code and a qualified engineer's mix design.
Where Finish coat is used
The weakest and most workable coat, applied thin. Being softer than the undercoat, it accommodates movement without pulling the wall apart.
Render is built up in coats, each one weaker than the coat beneath it. That way shrinkage stresses stay in the outer layer instead of pulling the render off the wall.
Need quantities? The volume calculators give the cubic yards, cubic metres and bag counts for the pour this mix goes into.