1. What is Screed Mix Ratio?

The screed mix ratio refers to the proportion of cement to sand used in creating floor screeds. Common ratios are 1:3 (cement:sand) for heavy-duty applications and 1:4 for standard applications.

2. How to Use This Calculator

This calculator helps determine the quantities of cement and sand needed for your screeding project:

1. Select your desired mix ratio (1:3 or 1:4)
2. Enter the area to be covered in square meters
3. Enter the screed thickness in millimeters
4. Click Calculate to get the required material quantities

3. Screed Mix Ratio Guidelines

Standard Mix (1:4): Suitable for most residential applications where moderate strength is required.

Strong Mix (1:3): Recommended for areas with heavy foot traffic or where greater durability is needed.

4. Application Tips

• Always use clean, sharp sand for best results
• Mix thoroughly to ensure consistent quality
• Apply screed in layers no thicker than 50mm at a time
• Allow proper curing time (typically 1 day per mm for the first 40mm)

5. Frequently Asked Questions (FAQ)

Q1: Can I use a different ratio than 1:3 or 1:4?
A: While possible, these are the standard ratios that provide optimal strength and workability.

Q2: How much water should I add?
A: Add water gradually until the mix reaches a workable consistency - it should hold its shape when squeezed.

Q3: What's the coverage per bag of cement?
A: Approximately 1.5m² at 50mm thickness for 1:4 mix (based on 25kg cement bag).

Q4: How long before I can walk on the screed?
A: Typically 24-48 hours for light foot traffic, but full curing takes 28 days.

Q5: Do I need to add any additives?
A: For most applications, no. Plasticizers can be added in difficult conditions.