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The bulk density of screed is 22KN/m³. Simply multiply by the thickness to get a weight.
22kN/m³ = 22000N/m³
1 Newton = Mass x Acceleration = kg * g (g is acceleration due to gravity)
On earth g is 9.8
22000N/m³ = 2245kg/m³
You then multiply this by the thickness to get the surface mass. Say it is 50mm
2245kg/m³ x 0.005m = 112.25kg/m²
You then multiply this by the area of the floor to get the total floor weight.
If you have 100m² floor area then
112.25kg/m² x 100m² = 11225kg
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