Radiant PEX Tube In Floor - Cement Slab with 1 Manifold - Typical Layout

Radiant PEX In Floor Heat Tubing Layout Tube In Cement Slab with 1 Manifold - Typical Layout with 3 Port Manifold. You will notice that the PEX Starts and comes back to the same location. You always want the hotest part of the PEX on an exterior wall and use bend supports or something else to protect the PEX when it comes out of the cement. 

Radiant PEX In Floor Heat Tubing Layout In Cement Slab with 1 Manifold - Typical Layout