How to lay warm floors
Prepare the base for laying the insulation layer by thoroughly cleaning it. For insulation, use foam, polystyrene or foam. Laying density should be at least 35 cubic meters per kilogram, and width - from 3 to 15 centimeters, depending on the thermal regime that you want to create in the room.
To compensate for the thermal expansion of the future concrete screed, fasten the damper tape around the entire perimeter. Its width should be at least 10 centimeters, and its thickness should be no more than 1 centimeter. Then over the entire area of the room lay a plastic wrap. Place a reinforcing mesh on top, with a square cell side equal to 15 centimeters. The thickness of the wire mesh must be at least 4 millimeters.
From above lay the contours of the pipe in the manner indicated on the project drawing. Connect the beginning of the pipe to the supply manifold and the end to the return one. Attach them to the reinforcement mesh with plastic clamps.To protect against external damage and maximum thermal insulation, wear a special corrugated pipe over the thermal one.
In order to give the future concrete screed additional strength, perform double reinforcement by placing a second layer of mesh on the pipes. Before pouring concrete, carry out hydraulic tests. To do this, pour water into the pipe at a pressure that would exceed the working one and a half times. It is necessary to perform the check for at least a day.
Reduce the pressure to the worker and proceed to the concrete screed. Its thickness should be above the level of pipes by 3 centimeters. The screed should be made at room temperature using sand concrete or sand cement mortar. You can level the floor using a hydro level. The term of drying of the concrete slab is at least 4 weeks. Only then can the flooring be laid.