Originally Posted by trees
A qualified in floor heat guy will pressurize the loops for about 48 hours before the pour and leave it on until ready to hook up the system to the manifolds. Having pictures of the loops before the pour helps to ease you mind when core drilling for anchor bolts later.
They never put any pressure on mine, but it was two big loops, one for each zone.
My house is the same I have five zones and they are each one loop no splices or breaks in tube from start to finish, And they run pretty close, when I say loop I might be using the wrong term, as the tube went back and forth across the room or zone, not a big circle.
It's just like wiring a car less breaks in a wire less trouble.
So one end was hooked up to the out manifold, the other to the return, there were no breaks in between.