1. What is the Standard Render Mix Ratio?

The standard render mix ratio is typically 1:3 or 1:4 (cement:sand). This ratio provides the optimal balance between strength and workability for most rendering applications.

2. How Does the Calculator Work?

The calculator uses the simple ratio formula:

Where:

• 1 — Part cement
• 3 or 4 — Parts sand
• Cement Quantity — Weight of cement in kilograms

Explanation: The ratio determines how much sand is needed for each part of cement to achieve the desired render mix.

3. Importance of Correct Mix Ratio

Details: Using the correct ratio ensures proper adhesion, durability, and workability of the render. A 1:3 mix is stronger but less workable, while 1:4 is more common for general purposes.

4. Using the Calculator

Tips: Enter the amount of cement you plan to use and select your desired mix ratio (1:3 for stronger mix or 1:4 for standard mix).

5. Frequently Asked Questions (FAQ)

Q1: Which ratio should I choose - 1:3 or 1:4?
A: Use 1:3 for areas needing higher strength or exterior applications. Use 1:4 for general interior rendering.

Q2: Can I use a different ratio?
A: While possible, deviating from standard ratios may affect the render's performance and durability.

Q3: Should I add lime to the mix?
A: For traditional renders, lime is often added (typically 1 part lime to 6 parts cement-sand mix) to improve workability.

Q4: How much water should I add?
A: Water should be added gradually until the mix reaches a workable consistency - about 20-25% of the total dry mix weight.

Q5: How does this compare to mortar mix ratios?
A: Render typically uses a leaner mix (more sand) than mortar, which often uses 1:2 or 1:3 ratios for bricklaying.