Installation Guide

HOME-FLEX CSST 27
Routing
when drilling clearance holes—no structural members should be compromised, weakened
or impaired by cutting, notching, drilling, or otherwise alternating the member.
Routing through holes in joists, rafters or similar wood structures
When HOME-FLEX® tubing is installed through
bored holes in joists, rafters, or other wood struc-
tures, the holes should be bored such that the
edge of the hole is at least 2 inches from the near-
est edge of the wood structure (Figure 4.4). If this
criterion can’t be met, the tubing must be protect-
ed by a striker plate of suitable size installed in
accordance with Section 4.4 (p. 29). The diame-
ter of the hole should be no more than 1/3 the
depth of the wood structure.
Holes and Cuts in Top and Sole Plates
Holes bored through top plates, top frame mem-
bers and sole plates should not exceed 50% of the
width of the structure, and should be in the center
of the structure. If a sole or plate is to be cut for the
routing of HOME-FLEX® tubing, the width of the
cut should be ½" greater than the outside diameter
of the tubing and no greater than 2 inches (Figure
4.5). Tubing must be protected with striker plates in
accordance with Section 4.4.
Routing through vertical wall framing
Requirements for boring through vertical mem-
bers of wall framing dier depending on whether
the member is bearing or not. For non-bearing
members (Figure 4.6), the size of the hole should
be no larger than 60% of the width of the member. For bearing members, the size of such
hole should be no more than 40% of the member. (Figure 4.7)
Routing through metallic surfaces
When installing HOME-FLEX® through galvanized steel studs, plastic grommets (often sup-
plied by the stud manufacturer) should be used to reduce potential damage to the yellow
jacket of the HOME-FLEX® tubing. When installing through holes in other metallic members,
the tubing must be similarly protected from contact with the member to prevent mechan-
ical wear on the yellow jacket and tubing. Acceptable means of protection include: rubber
Figure 4.4 Holes in Wood Structures
Preferred
location
D/3
Max
D/3
Max
D
2"
Min
2" Min
Figure 4.5 Holes and Cuts in Top and Sole Plates
2x4
2x4
Stud
Top Plate
Sole Plate
2” Max.
Cut Width
W
Hole for Tubing
W/2 Max
W/2
W/2
Figure 4.6 Holes in Non-Bearing Walls
2x4
Holes up to 60%
of Stud Width
Non-bearing Wall
2
1
⁄8"
Max
3
1
⁄2"
1
1
⁄2"
5
⁄8"
Max
Figure 4.7 Holes in Bearing Walls
2x4
Non-bearing Wall
Holes up to 40%
of Stud Width
1
3
⁄8"
Max
3
1
⁄2"
1
1
⁄2"
1"
Max