A 1:4 screed for floating construction over insulation or a DPM, laid thicker (50 mm+) and often lightly reinforced against curling.
Mix ratio
1 : 4
Cement : Sharp sand
Proportions & strength
Unbonded / floating screed: proportions by volume, typical compressive strength and use.
Designation
Floating screed
Ratio (by volume)
1 : 4
Cement
1 part
Sharp sand
4 parts
Typical compressive strength
2,900 psi · 20 MPa
Typical use
Screed over insulation or a membrane (50 mm+).
Planning reference. Strengths are typical values for a well-made mix at 28 days, not a guaranteed design strength. Structural work must follow your local building code and a qualified engineer's mix design.
Where Floating screed is used
A 1:4 screed for floating construction over insulation or a DPM, laid thicker (50 mm+) and often lightly reinforced against curling.
Screed is a semi-dry mix - just damp enough to hold together when squeezed. Too much water and it shrinks, curls and cracks as it dries.
Need quantities? The volume calculators give the cubic yards, cubic metres and bag counts for the pour this mix goes into.