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3/8 in. Backer Rod, Soft (Per Ft) - 3/8 INCH DIAMETER POLY BACKER ROD, SOFT, NON-STICK CLOSED CELLED SKIN, PRICE/FOOT. ORDER BY THE FOOT.  (custom-cut items are non-returnable or cancellable)
3/8 in. Backer Rod, Soft (Per Ft)
$0.15 SALE $0.10
(Savings: $0.05)
 Buy 200 or more and pay $0.08 each (save $0.07) 
 Buy 400 or more and pay $0.07 each (save $0.08) 
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PRODUCT:  3/8 inch DIAMETER POLY BACKER ROD, SOFT, NON-STICK CLOSED-CELLED SKIN. PRICE / FOOT. (custom-cut items are non-returnable or cancellable)

  • General Purpose Sealant backing
  • Together with Self-leveling sealant
  • Expansion joints
  • Irregular joints
  • Metal and pre-cast panels
  • Around perimeters of door and window frames,
  • Coping and glazing joints
  • Log Homes
  • Round poly foam joint filler and backing for sealants.
  • Provides controlled depth for sealants.
  • Compresses easily for accommodating joints of varying widths.
  • Does not stick to sealants. Exceeds ASTM standards for bond breaker materials.
  • Consists of both open and closed cells on the inside with a skin-like outer texture. Non-stick closed cell skin. High moisture resistance.
  • Compatible with all know types of sealants including butyl, polyurethane, silicones, tri-polymer, polysulfide, acrylic, etc.
Select a backer-rod diameter that is  approximately 25% larger than the width of the joint.

Joint Width  Diameter
3/16" - 1/4"    3/8"
3/8" - 1/2"      5/8"
1/2" - 3/4"      7/8"
3/4" - 7/8"      1-1/8"
7/8" - 1-1/4"   1-1/2"
1-1/4" - 1-1/2"  2"
2" - 2-1/2"        3"
2-1/2" - 3"        4"
1. Joint fillers have three major functions:
  • Controls depth of the sealant in proper
    relation to joint width
  • Provides backing against which the sealant
    is applied, forcing the sealant to the sides of the
  • Prevents 3-sided bonding, ensuring proper
    function of sealant
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. 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 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
similar product terms: backer rod, soft celled backer rod, chinking, chink backing, caulk backing, sealant backing, sealant support, caulk support, soft cell foam, closed cell foam rod, log home chinking

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