Installation Instructions

ManualsBrandsPro Flex ManualsFittings & Accessories1/2" x 25' CSST Tubing

CLEARANCE HOLES & NOTCHING

a. Bored Holes - In locations where CSST is installed through bored

holes in joists, rafters, or wood members, holes shall be bored so

that the edge of the hole is not less than 2 inc. (50.8 mm) from the

nearest edge of the wood member. Where this distance cannot be

maintained at any point, the CSST shall be protected by a listed

striker plate of the appropriate length and width installed in accor-

dance with the manufacturers installation instructions. The diame-

ter of the bored holes shall be a minimum of 1/2 in. (12.7 mm)

larger than the outside diameter of the tubing.

b. The size of the hole drilled through top plates, top frame members,

and sole plates, to allow the vertical passage of the tubing, shall

not exceed 1/2 of the width of the member. The hole should be

bored through the center of the member. (See figure 4-1.)

c. Where soles or plates are cut for tubing, the width of the cut shall

be 1/2 in. (12.7 mm) larger than the outside diameter of the tubing

but not greater than 2 in. (50.8 mm), and the tubing must be

protected with a listed striker plate of the appropriate length and

width installed in accordance with the manufacturers installation

instructions. (See figure 4-1.)

d. Where a hole is to be bored in a joist, the hole should be located

at the centerline, otherwise no closer than 2 in. (50.8 mm) from the

nearest edge of the joist, and the hole diameter shall not exceed

1/3 the depth of the joist.

(See figure 4-2.)

e. Where holes are to be bored in non-bearing vertical members of

the wall framing, the siz

e of such holes shall not be larger than 60

percent of the width of the member. (See figure 4-3.)

Where holes are to be bored in bearing vertical members of the

wall framing, the size of such holes shall not be larger than 40 per-

cent of the width of the member. Holes up to 60 percent of the

member’s width are permitted if the members are doubled. No

more than two successive double bored members are permitted.

(See figure 4-4.)

g. Installing CSST in notches cut in either the top or bottom of joists

are prohibited.

The size and depth of installation clearance holes or notches for

routing the tubing through wall studs and joists shall comply with the

requirements of the local building code.

CSST THROUGH METAL FRAMING

a. When CSST passes through metal members, it shall be installed

and protected in accordance as follows:

b. When using Pro-Flex

Flexible Gas Piping (CSST) thru Metal

Enclosures the CSST tubing must be protected by grommets,

bushing or armor (Floppy-Flex

™

), PVC tape, shrink sleeve material

or a minimum of four (4) wraps of #10 Mil Duct-Tape. This is to

ensure that no physical contact will be made between the metal

and the CSST tubing that would cause mechanical wear.

DRILLING:

Drilling holes should be made approx. 1/2” greater than the outside diameter of

the CSST Tubing.

FIGURE 4-2 - Holes in Wood Joints

FIGURE 4-1

Holes and Cuts in Top and Sole Plates

FIGURE 4-4

Holes in Bearing Walls

Recommended Installation for

Clearance Holes for Routing CSST

ubing Size Drill Hole Size

3/8" 1-1/8"

1/2" 1-3/8"

3/4" 1-1/2"

1 1-3/4"

/4" 2-1/4"

No more than two successive

double board studs permitted

FIGURE 4-3

Holes in Non-Bearing Walls

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