Proportions
| Cement | 1 part |
|---|---|
| Sharp sand | 4 parts |
| Typical strength | 2,900 psi · 20 MPa |
Screed
Screed mix ratio over underfloor heating
Over underfloor heating and insulation, a 1 : 4 floating screed at 50 mm or more is used, often lightly reinforced against curling.
Recommended mix
1 : 4cement : sharp sand
Unbonded / floating screed — about 2,900 psi (20 MPa).
Planning reference. Typical proportions and strength for general work, not a structural mix design. Load-bearing and structural work must follow your local building code and a qualified engineer's specification.
Why this mix
A 1:4 screed for floating construction over insulation or a DPM, laid thicker (50 mm+) and often lightly reinforced against curling.
Once you know the mix, the volume calculators tell you how much of it to buy — cubic yards, cubic metres and the bag count in every size.
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