Install Instructions

IM-PR 566442 1114 (Design Manual)

FostaPEX:

FostaPEX tubing has a fully dimensioned PEX wall with additional outer layers of aluminum and

polyethylene. As a result of these extra layers, FostaPEX expands considerably less than that of standard

PEX tubing and slightly more than copper tubing (0.16" per 100' per 10°F).

An approved method for expansion absorption when using FostaPEX is through the use of a coiled loop

expansion compensator (at least every 50 ft.). Do not use fitting offsets as described on prior pages

with FostaPEX as the stiffness of FostaPEX may lead to high stress at connections.

Coiled loop:

The coiled loop configuration calls for loops within

the piping system. The diameter of the loop (D) is

shown below and will increase or decrease as the

tubing in the system expands and contracts.

NOTE: Tubing fasteners should be secured as to

not prevent linear movement of tubing.

NOTE: Refer to Viega installation manuals for

recommended operating temperatures, pressures,

tubing fasteners and fastener spacing.

Tube nom. D (in)

½" FostaPEX 12"

⅝" FostaPEX 14"

¾" FostaPEX 16"

1" FostaPEX 20"

Table 1-13