6 in. Backer Rod, Closed Cell (6 Ft) - 6 inch Diameter Poly Backer Rod, Closed Cell, White Color, Non-Stick Skin, 6-Foot Pieces (actual size varies ~69-72 inches). Price/Each.
6 in. Backer Rod, Closed Cell (6 Ft)
$40.00 SALE $29.99
(Savings: $10.01)
 Buy 10 or more and pay $29.20 each (save 27.00%) 
 Buy 20 or more and pay $28.80 each (save 28.00%) 
 Buy 30 or more and pay $28.40 each (save 29.00%) 
 Buy 60 or more and pay $28.00 each (save 30.0%) 
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6" Diameter Poly Backer Rod, Closed Cell, White Color, Non-Stick Skin, 6-Foot Pieces (actual size varies ~69-72 inches). Price/Each.

Ordering Notes:

  • Shipping leadtime: 1-2 business days.


Round, firm, resilient, polyethylene extruded closed celled foam with a water resistant outer skin. Provides controlled depth for sealants. Compresses up to 50% in smaller sizes and 30% 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.


  • 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

Sizing Soft Backer Rod:

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

Joint Width  Recommended Diameter
1-1/4" - 1-1/2"   2"
2" - 2-1/2"         3"
2-1/2" - 3-1/2"   4"
3-1/2" - 4-1/2"   5"
4-1/2" - 5-1/2"   6"

Applying Backer Rod:

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. Install backer-rod using a blunt tool or a plain faced roller.

3. Force the rod to the depth recommended by sealant manufacturer, (typically about 1/2 of joint width measured at the crown of the backer rod). A template or roller gauge may be used to control the depth at which the rod is placed.

4. Don't 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 sides of joint is necessary to assure good adhesion of sealant, 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, tilt wall seal, tilt wall sealant, tilt wall gap seal, caulk backing, sealant backing, sealant support, caulk support, soft cell foam, closed cell foam rod, log home chinking

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