A one-size-fits-all approach to radiant tubing installation can land you in hot water.
In the first case, the 1/2-inch PEX tubing that was stapled to the underside of the plywood subfloor was “migrating.” The installer told me that some tubing runs had moved about 2 feet since being stapled in place. The system was also making objectionable “ticking sounds” each time the zone thermostat called for heat.