Childers® Chil-Low™ CP-38 Vapor Retarder Coating

• It is ideal for use over ASJ, FRK and FSK jackets and board facings to give a vapor retarding seal at joints, laps and over staples and weld pin punctures.
• It can also be used as a duct board closure sealant.

• Always test foil and paper facings for acceptable adhesion before using.
• Outdoor horizontal surfaces must always drain completely.
• A pitch of at least 1/2 inch per foot (4 cm/m) is required.
• To resist rain wash-off, allow at least 12 hours drying time above 50°F (10°C), with a relative humidity of 50%.
• Higher humidity and/or lower temperature may retard drying. Do not apply over 1/8” (3.2 mm) wet film thickness.
• Select this in white color for use over polystyrene insulation outdoors. May weather to an off-white color after exposure.

• Subject to the surface being coated. Wet coverages shown below are for smooth, non-porous surfaces.
• Porous or rough surfaces will require higher gallonage to attain required dry thickness.

Use Of Material:

• Stir well. Do not thin. Apply only to clean, dry, oil-free surfaces.
• Keep container closed when not in use.

Application – Indoor and Light Duty Outdoor:

• To prevent water vapor and moisture infiltration, proper and complete flashing is required. Follow flashing specifications.
• Apply tack coat of CP-38 CHIL-LOWTM Vapor Retarder Coating at 2 – 4 gallons per 100 square feet (0.8 – 1.6 l/m2 ).
• Embed CHIL-GLAS® #10 Membrane into the wet tack coat. Smooth membrane to avoid wrinkles and overlap all seams at least two inches (5 cm).
• Apply finish coat of CP-38 CHIL-LOWTM Coating, within 1/2 hour of the tack coat application, at 2 gallons per 100 square feet (0.8 l/m2 ).
• This application shall provide a minimum dry thickness of 37 – 56 mils (0.9 – 1.4 mm).

Brush:

• Use a good brush, suitable for water-based paints, making strokes as long as possible over the surface. Apply with full brush and spread out evenly. Do not overwork.

Spray:

• CP-38 CHIL-LOWTM Vapor Retarder Coating may be airless spray applied.
• For spray equipment information, please consult Airless Spray Recommendations or contact your spray equipment supplier.
• Average viscosity range: 60,000 – 90,000 cps. Corrosion resistant pumps and fittings are suggested.

Clean Up:

• Use fresh water to clean brushes and equipment before product dries.
• Dry product may be removed with hot soapy water (with ammonia added) or strong solvents such as chlorinated solvent (non-flammable) or xylol (flammable).

Inspection:

• Where available, it is suggested to use a National Insulation Association (NIA) certified (or other similarly certified) mechanical insulation inspector throughout the project to inspect and verify the materials and total insulation system have been installed correctly in accordance with the specifications.

Suggested Specifications for Vapor Sealing Insulation on Low Temperature Equipment, Chilled Water or Refrigerated Piping and Fittings:

• The insulation on all piping, fittings, and equipment shall be vapor sealed with Childers® CP-38 CHIL-LOWTM Vapor Retarder Coating.
• The first coat shall be a tack coat applied at a coverage rate of 2 U.S. gals./100 sq. ft. (0.8 l/m2 ).
• While still wet, a layer of CHIL-GLAS® #10 Glass Fiber Reinforcing Mesh shall be embedded, with all seams overlapped a minimum of 2" (5.08 cm).
• A finish coat at a coverage rate of 2 U.S. gals./100 sq. ft. (0.8 l/m2 ) shall be applied so that the total wet film thickness is a minimum of 0.064" (1.6 mm).
• This will provide a minimum dry film thickness of 0.037" (0.9 mm).

Notes to Specifying Engineer:

• Childers® CP-38 CHIL-LOWTM Vapor Retarder Coating is white in color and should be specified where white All Service Jacketing (ASJ), canvas or other white coatings/finishings are specified on the adjoining pipe or equipment insulation.
• Do not use over copper clad wire.
• All horizontal surfaces must be sloped at least 1/2 inch per foot (4 cm/m) to assure water run-off and prevent the ponding of rain water and melting snow or ice.

Surface Burning Characteristics¹

• Surface: Inorganic reinforced cement board
• Number of Coats: 1