Skip to Content


Closed cell polyethylene backing rod

  • Controls joint depths and ensures a proper width to depth ratio
  • Non absorbent surface eliminates three sided adhesion
    of the elastomeric sealant
  • Forces sealant to have maximum sidewall adhesion

Features and benefits

Non absorbent backing rod to maintain proper width to depth ratio and avoid 3 side adhesion of sealants.



POLYBIT® POLYROD is a closed cell, non absorbent and chemically inert polyethylene foam flexible rod. POLYROD is designed for use as a compressible joint backing material for elastomeric and a wide variety of cold applied joint sealants. Available Size: 10mm, 15mm, 20mm, 25mm, 30mm, 40mm & 50mm.

Documents and downloads

How to use

Joint preparation

The joint surface must be clean, dry and free from oil, loose particles, cement laitance and other contaminants which may affect the adhesion. A thorough wire brushing, grinding, sand blasting or solvent cleaning may be required to expose a clean and sound substrate. On painted surfaces all loosely adhering paint must be removed, if in doubt remove all previous decorations. Remove all round or sharp edges and corners which might perforate or cause damage to the backing rod. The compressible joint filler shall be cut back to expose a uniform joint depth.


Select a backer rod whose diameter is at least 20% larger but not greater than 33% of the joint width. This will ensure that the backer rod remains in compression and in place during sealant installation. The backing rod shall be inserted into the joint by using a blunt tool or roller and forced gently into the joint till the desired depth is achieved, whilst making no damages to the joints & edges. 


Store in a cool, dry place and keep away from all sources of heat. 

Related articles

  • Bitustick Cool

    The Next Generation of Performed Bituminous Coatings 

  • Foundations and Roofing Systems

    Discover, feel and touch our systems, through our mockup simulation boxes 

  • Wet Areas and Flooring Systems

    Discover, feel and touch our systems, through our mockup simulation boxes 

  • Polycryl FR

    The Ultimate Fire Rated Coating Solution 

  • Polycryl PF

    Strong UV protection For Polyurethane Foam Roof  

  • Bituplus Ultra

    The Ultimate Torch On Membrane Range 

Related products

  • ${/content/heliux/adhesive/polybit/com/en/products/central-pdp#/polybit-polyseal-ps-pg/SAP_0201PYP34GO1/searchResult.productFields.MainImageAltText}
    Highly flexible, non-staining joint sealant with excellent recovery. 
  • ${/content/heliux/adhesive/polybit/com/en/products/central-pdp#/polybit-polyprime-ps/SAP_0201P1P34GL7/searchResult.productFields.MainImageAltText}
    POLYBIT Polyprime PS
    Seals the joint surface and increase the adhesion with the joint sealant. 
  • ${/content/heliux/adhesive/polybit/com/en/products/central-pdp#/polybit-polyboard/SAP_0201P1P34GE6/searchResult.productFields.MainImageAltText}
    POLYBIT Polyboard
    Polyboard is a compressible bitumen impregnated fibre board for expansion joints. 

Frequently asked questions

Yes. It is a bitumen free product

Yes. This product is weather resistant

Polyrod is a closed cell, polyethylene foam flexible rod.