Sand Cement Render Calculator

Render Material Equations:

\[ \text{Cement (kg)} = \left[\text{Area (m²)} \times \text{Thickness (m)} \times 1.33 \times \left(\frac{1}{1 + \text{ratio}}\right)\right] \times 1440 \] \[ \text{Sand (kg)} = \left[\text{Area (m²)} \times \text{Thickness (m)} \times 1.33 \times \left(\frac{\text{ratio}}{1 + \text{ratio}}\right)\right] \times 1600 \]

Cement Required:

Sand Required:

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1. What is Sand Cement Render?

Sand cement render is a mixture used to coat walls and ceilings, typically consisting of cement, sand, and water in specific proportions. The most common mix ratio is 1:4 (cement:sand).

2. How the Calculator Works

The calculator uses these equations:

\[ \text{Cement (kg)} = \left[\text{Area} \times \text{Thickness} \times 1.33 \times \left(\frac{1}{1 + \text{ratio}}\right)\right] \times 1440 \] \[ \text{Sand (kg)} = \left[\text{Area} \times \text{Thickness} \times 1.33 \times \left(\frac{\text{ratio}}{1 + \text{ratio}}\right)\right] \times 1600 \]

Where:

1.33 — Factor accounting for material compaction and waste
1440 — Density of cement (kg/m³)
1600 — Density of sand (kg/m³)
Ratio — Cement to sand proportion (e.g., 4 for 1:4 mix)

3. Importance of Proper Mixing

Details: Using the correct ratio ensures proper strength, workability, and durability of the render. Too much cement can cause cracking, while too little reduces strength.

4. Using the Calculator

Tips: Measure area accurately in square meters. Typical thickness is 15mm (0.015m) for exterior walls. Standard ratio is 1:4 (cement:sand) for most applications.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical thickness for render?
A: Exterior walls usually 15-20mm (0.015-0.020m), interior walls 10-15mm (0.010-0.015m).

Q2: What ratio should I use?
A: 1:4 is standard for most applications. Use 1:3 for areas needing extra strength.

Q3: How much water should I add?
A: Enough to achieve a workable consistency - about 20-25% of the cement weight.

Q4: Does this account for wastage?
A: Yes, the 1.33 factor includes typical wastage and compaction.

Q5: Can I use this for concrete?
A: No, concrete has different density and mix requirements.