Where embedded in or installed under a concrete slab,
tubing shall be protected from damage at penetrations of
the slab with a protective pipe sleeve. The space between
the tubing and sleeve shall be sealed. The tubing at the
location of an expansion joint in a concrete slab shall be
encased in a protective pipe sleeve that covers the tubing
not less than 12 inches (305 mm) on either side of the
expansion joint or the tubing shall be installed below the
slab.