PEX Crimp Fitting （https://www.ppsu-pex-fittings.com/product/f2159-pex-crimp-fitting/） installation precautions:

　　 1. When constructing the surface layer, it is not allowed to pick, chisel, cut, drill and nail the filling layer, and no objects shall be wedge into the filling layer;

　　2. The construction of the floor heating surface layer must be carried out after the filling layer reaches the required strength;

　　3. At the junction of the surface layer (stone, facing brick) and the internal and external walls, columns, etc., there should be 8mm wide expansion joints (shield by skirting); when laying wooden floors, ≥14mm expansion joints should be left;

　　4. For wet rooms such as toilets, waterproof the upper part of the PEX Expansion Ring （https://www.ppsu-pex-fittings.com/product/metric-size-fitting/metric-size-fitting-reinforcing-ring/） filling layer again.