Mortar with low water-cement ratio should be used for floor heating, and the ratio of cement mortar is 1: 2.5- 1: 3. It's better to add less water, and it's easier to wipe it by hand. Too much water will reduce the strength. Generally, it is wiped as you hit it. There is no need to wipe it twice. Just keep it for a week.

Cement mortar consists of cement, fine aggregate, water and lime, active admixture or additives added as needed, and is divided into cement mortar and cement mixed mortar.

Generally, 1: 3 cement mortar is made of 1 unit weight cement and 3 unit weight sand, which actually ignores the composition of water, and the ratio is generally around 0.6, that is, it should be 1: 3: 0.6, and the density of cement mortar is 2000Kg/m3.