4 in. Backer Rod, Closed Cell (6 Ft) - 4 INCH DIAMETER POLY BACKER ROD, CLOSED CELL, NON-STICK SKIN, 6-FOOT LENGTH/PIECE. PRICE/PIECE. (color is generally white but could be gray, white or charcoal and is not selectable; 8 pieces/carton).
4 in. Backer Rod, Closed Cell (6 Ft)
$18.00 SALE $14.75
(Savings: $3.25)
 Buy 8 or more and pay $12.85 each (save $5.15) 
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PRODUCT: 4" DIAMETER POLY BACKER ROD, CLOSED CELL, NON-STICK SKIN, 6-FOOT LENGTH/ PIECE. PRICE/PIECE. (color is generally white but could be gray, white or charcoal and is not selectable; 8 pieces/carton order full cartons for discounts)

  • 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
  • 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 breaker 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.
  • CARTON PACKING: 8 pieces/carton, 14 lbs, 17x10.3x74 inch size).
SIZING BACKER-ROD:  Select a backer-rod diameter that is approximately 25% larger than the width of the joint.

Joint Width  Recommended 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" - 3-1/4"   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 joint;
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
Email us at sales@bestmaterials.com or
Call us at 1-800-474-7570 or 602-272-8128
You'll get a prompt reply!
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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