Concrete Overlay Thickness Calculator
Find a minimum overlay thickness from aggregate size and bonding type.
Work It Out And Get Clear Answers
Find a minimum overlay thickness from aggregate size and bonding type.
Concrete Overlay Thickness Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Press Calculate to see the result.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Concrete Overlay Thickness Quick Guide
Typical values for reference.
| Max aggregate size (mm) | Bonded overlay (1) or unbonded (0) | Minimum overlay thickness |
|---|---|---|
| 10 | 1 | 30 mm |
| 5 | 1 | 25 mm |
| 20 | 1 | 60 mm |
| 10 | 0.5 | 100 mm |
| 10 | 2 | 30 mm |
| Rule of thumb: check your inputs, use the result as a guide and round sensibly. | ||
Concrete Overlay Thickness FAQ
Answers to common questions about this calculator.
Rule of thumb: bonded overlays at least 25 mm and 3× aggregate size; unbonded at least 100 mm and 6× aggregate size. Check with a specialist.
It uses the default inputs shown and the formula described above. Change any value and press Calculate to see how the result moves.
It is an estimate based on the inputs you enter. Check real quotes, labels, product data or official guidance for important decisions.
Yes. Replace each input with your own figures and press Calculate to update the result.