The tube should be sleeved with a compatible sleeving where it penetrates the slab. Underslab installations with joints should be pressure-tested prior to pouring the slab. Underslab installations without joints do not require pressure testing prior to pouring the slab. FlowGuard Gold tubing will expand approximately 1 inch per 50 feet of length with a 50 F temperature change. Expansion does not vary with pipe size.
Expansion is mainly of concern on hot water lines.
Therefore, expansion loop requirements are not significantly different than those recommended for copper tubing.