Subject: Properly Sealed PVC Jacket Systems Provide Continuous Protection of Insulation Materials

Achieve USDA acceptance and keep water from entering your refrigeration insulation system by installing PVC jacket(cladding) over your selected insulation material and vapor barrier jacket. Specify heavy gauge .030 PVC fitting covers on all pipe fittings, flanges, valves, pipe terminations and .030 mil thickness on straight piping runs. (Note: Holes may occur in .020 mil thick PVC if the solvent welding adhesive is applied too thickly.)

Once your pre-molded pipe insulation and insulation fittings complete with vapor barrier system is installed on the piping system the PVC jacket may be applied.

Start by installing the PVC fitting covers over the insulation. Seal the throat overlap with the recommended solvent welding adhesive. An elastic cord or tape should be used to hold the cover in place for at least 10 minutes while the adhesive takes an initial set. Any exposed adhesive in the lap area should be feathered along the lap seam.

The PVC jacketing is then applied over the pipe insulation and should overlap the fitting cover by a minimum of 1". Apply welding adhesive in the circumferential lap between the jacket and the fitting cover as well as along the 2" longitudinal overlap of the jacket. Elastic cord or tape should again be used to hold jacket in place for at least 10 minutes. Subsequent sections of jacketing should be applied as above, with appropriate amounts of circumferential and longitudinal overlap.

Upon completion, all seams should be visually inspected for sealing and touched up with adhesive where necessary. Complete curing of the welding adhesive takes approximately 8 to 10 hours.

A common mistake when applying PVC jacketing is the failure to install slip joints. Due to linear movement associated with the thermal expansion and contraction of piping a slip joint on long continuous runs; approximately every 24 - 30 feet, and between fittings if the distance exceeds 8 feet, is required. The amount of system temperature variation will determine the number of slip joints required.

Slip joints are made by extending the overlapping section 8 - 10 inches beyond normal. Apply flexible caulking or silicone in 3 continuous beads 1 inch apart under this overlap to maintain the sealed system. The longitudinal laps will be sealed with the solvent welding adhesive. NOTE: Always install a slip joint between fixed supports.

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