what is backer rod used for

what is backer rod used for

Foam backer rod is available in a number of variations fitted to particular tasks. Earlier than making a variety, it’s necessary to completely assess the designed traits for the supposed utility goal.

What’s a backer rod and what does it do?

Backer rods are normally spherical, versatile lengths of froth which are used as a “backing” in joints or cracks to assist management the quantity of sealant/caulking used and create a again cease. Many sizes/diameters can be found for optimum becoming to the dimensions of the joint being sealed. Apart from form, an necessary attribute is the number of foam cell construction sorts: closed cell, open cell, and bi-cellular. It’s necessary to know that cell construction makes a crucial distinction in terms of irregular joint utility, the specified flexibility within the joint, or sealant getting used. Armacell’s FillPro™ backer rod materials is created from polyethylene or polyurethane foam, making it appropriate with the widespread trade joint sealants or caulking.

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Backer Rod’s 4 essential advantages:

  • Enhance elasticity within the joint sealant.
  • Cut back caulk consumption by controlling sealant depth— this prevents extreme use of caulking or sealant.
  • Power adhesive into contact with the edges of the joint creating an hour-glass form for a superior bond.
  • Create a “bond-breaker” which permits the joint to be simply cleaned out and refilled as wanted over time.

Closed Cell

Closed cell foam is distinct in that its cells are completely enclosed by its partitions and never interconnecting with different cells. This implies the fabric won’t wick moisture making it appropriate for joints with a excessive presence of water or dampness. Sealants, caulking or different chinking supplies will stick extra simply to closed cell backer rods which have a greater bonding floor space than an open cell product. FillPro Normal is an efficient instance of a closed cell PE backer rod.

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Widespread makes use of:

  • Glazing installations
  • Window and door purposes
  • Growth joints
  • Curtain wall joints
  • Partitions
  • Log development
  • Pavement joints and repairs
  • Pre-cast models and copings

Some closed cell backer rods are crosslinked PE, making a product that not solely resists moisture, but additionally can stand up to sealant temperatures as much as 400°F. Armacell’s Sizzling Rod XL, is a perfect materials for hot-pour sealants.

Widespread Makes use of:

  • Contraction and growth joints of concrete highways
  • Runways
  • Driveways
  • Parking Tons

Open Cell

Open cell backer rod is exclusive; it will probably simply compress and return to its unique state as a consequence of unrestricted air motion. This flexibility makes it simply conform to sealing purposes and helps restrict the depth of the sealant whereas additionally including good sealant airing, which might scale back drying or arrange time. FillPro Open Cell is a extremely conformable “spool-less” backer rod obtainable in baggage.

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Widespread makes use of:

  • Growth and contraction joints
  • Window glazing
  • Curtain wall
  • Development partitions
  • Precast assemblies and copings
  • Parking decks
  • Bridge development

Open cell backer rods might not be very best for sealants which are vulnerable to effervescent of air escaping the backer rod materials.


FillPro Delicate Sort is a novel bi-cellular development that provides excessive compressibility, however has a closed cell outer pores and skin to withstand moisture. That is fitted to specialty purposes the place normal backer rods are usually not applicable, and is good in irregular joint purposes the place self-leveling, flowable sealants are employed. Bi-cellular can be advisable with sealants the place effervescent considerations are crucial. It’s a superb all-purpose backer rod which may be used rather than most traditional backer rod purposes.

Widespread makes use of:

  • Irregular joint purposes

Armacell provides the widest vary of backer rod supplies obtainable available on the market in the present day. For extra info, go to our product pages right here.

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