1. What is Screed Concrete?

Screed is a thin layer of cement paste and sand mortar that is applied to a concrete base to create a smooth, level surface for flooring. The correct ratio of cement to sand is crucial for achieving the desired strength and workability.

2. How Does the Calculator Work?

The calculator uses the following formulas:

Where:

• 1.33 — Standard factor for screed mix
• 1440 — Density of cement (kg/m³)
• 1600 — Density of sand (kg/m³)
• ratio — Cement:sand ratio (e.g., 1:3 ratio means 3 parts sand to 1 part cement)

3. Importance of Accurate Material Calculation

Details: Proper material calculation ensures you have enough materials to complete the job without excessive waste, helps maintain the correct strength and consistency of the screed, and allows for accurate cost estimation.

4. Using the Calculator

Tips:

• Measure the area accurately in square meters
• Determine the required thickness (typically 25-50mm for domestic applications)
• Select the appropriate cement:sand ratio (common ratios are 1:3 to 1:5)
• Add 5-10% extra to account for wastage and uneven surfaces

5. Frequently Asked Questions (FAQ)

Q1: What is the standard thickness for floor screed?
A: For domestic applications, 25-50mm is typical. Commercial applications may require thicker screeds.

Q2: What cement:sand ratio should I use?
A: Common ratios are 1:3 to 1:5 (cement:sand). 1:3 provides higher strength, 1:4 is standard, 1:5 is for lighter duty.

Q3: How does thickness affect material requirements?
A: Material requirements increase linearly with thickness - doubling the thickness doubles the materials needed.

Q4: Should I account for wastage?
A: Yes, it's recommended to add 5-10% to the calculated amounts to account for spillage, uneven surfaces, and mixing losses.

Q5: How long does screed take to dry?
A: Typically 1 day per mm for the first 40mm, then 2 days per mm thereafter. Full curing takes about 28 days.