3 Inch Backer Rod, Closed Cell (6 ft. Piece) - 3 INCH DIAMETER POLY BACKER ROD, CLOSED CELL, NON-STICK SKIN, 6-FOOT LENGTH/PIECE (actual length about 69 inches). PRICE/PIECE. (color could be white, gray or charcoal and is not selectable).
3 Inch Backer Rod, Closed Cell (6 ft. Piece)
$12.00 SALE $8.99
(Savings: $3.01)
 Buy 17 or more and pay $8.28 each (save 31.00%) 
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3 inch Diameter Poly Backer Rod, Closed Cell, Non-Stick Skin, 6-Foot Length/Piece (actual length about 69 inches). Price/Piece.


  • Color could be white, gray or charcoal and is not selectable.


Round, resilient, polyethylene extruded closed celled foam with a water resistant outer skin. Provides controlled depth for sealants. Compresses up to 50 percent in smaller sizes and 30 percent in large sizes. Does not stick to sealants. Exceeds ASTM standards for bond breakering materials. No bond breaker is required. Very high moisture resistance. Will not absorb ground water. Compatible with all know types of sealants including butyl, polyurethane, silicones, tri-polyimer, polysulfide, acrylic, etc.

Color could be white, gray or charcoal and is NOT SELECTABLE.


  • High moisture environments
  • Ground based expansion joints
  • General purpose sealant backing
  • Use together with self-leveling sealant
  • Highway joints
  • Parking garages
  • Around perimeters of door and window frames
  • Coping and glazing joints
  • Log Home chinking
  • Isolation joints


Select a backer-rod diameter that is approximately 25% larger than the width of the joint.

Joint Width   Diameter
3/16"            1/4"
1/4"              3/8"
3/8"              1/2"
1/2"              5/8"
5/8"              3/4"
3/4"              1"
1"                 1-1/4"
1-1/4"           1-1/2"
1-5/8            2"
2"                 2-1/2"
2-1/2"           3"
3-1/2"           4"


1. Joint or opening should be clean and dry and free of all contaminates, loose materials, dry, and free of water or frost.

2. To install, compress backer-rod into the joint before sealants are applied. Joint or opening should be clean and dry and free of obstructions. Install backer-rod using a blunt probe or a plain faced roller to force the rod to the desired depth.

3. Compress to a depth of about 1/2 of the width measured at the crown of the backer rod.

4. A template or roller gauge may be used to control the depth at which the rod is placed.

5. Do not stretch, puncture or tear backer-rod during installation but gently force into the joint so that the backer-rod fits tight against the sides of the joint.


1. Follow suggestions for joint-sealant application as directed by sealant manufacturer.

2. Where priming of the joint is necessary, primer should be applied only to the joint surfaces and allowed to dry before Backer-Rod is placed. DO NOT prime Backer-Rod.


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Call us at 1-800-474-7570 or 602-272-8128
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similar product terms: backer rod, closed cell backer rod, chinking, caulk backing, sealant backing, sealant support, caulk support, closed cell rod, closed celled foam, closed celled rod, closed celled backer rod, mile high foam

  Associated Items:  
3 in. x 6 ft. Backer ROD, Closed Cell, Carton/102 ft. East Coast WH
3 inch Diameter Closed Cell Polyethylene Foam Backer Rod. 6 feet/Piece. 17 Pieces/Carton, 102 feet/Carton (31 meters). Price/Carton. (ships from our EAST Coast Warehouse; shipping leadtime 2 business days; UPS shipping only)
$185.00 $141.99
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