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PEF Backing Rods

Closed-Cell Polyethylene Joint Backing for Sealant Applications

  • Controls sealant depth for optimum joint performance
  • Compatible with most construction sealants
  • Available in multiple diameters to suit any joint size
PEF Backing Rods

Product Overview

PEF Backing Rods, also known as PEF Gap Fillers, are closed-cell polyethylene joint backing materials designed for use in conjunction with sealants. They are installed into joints prior to sealant application to control sealant depth, improve joint performance, and prevent three-sided adhesion.

By providing a firm yet compressible backing, PEF Backing Rods help ensure correct joint geometry, enhance sealant durability, and reduce material consumption. They are lightweight, flexible, non-absorbent and compatible with most common construction sealants.

Find out how you can get Backing Rods in Private Label

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Recommended Uses

  • Joints between precast concrete panels
  • Saw-cut joints in concrete floors
  • Expansion joints in brickwork and masonry
  • Peripheral joints around aluminium and timber windows
  • General construction joints prior to sealant application

Advantages​

  • Closed-cell polyethylene – non-absorbent and moisture resistant
  • Helps achieve correct sealant depth and joint profile
  • Prevents three-sided adhesion, improving sealant performance
  • Compressible and flexible for easy installation
  • Lightweight and easy to handle on site
  • Compatible with most sealant types
  • Improves long-term durability of sealed joints
  • Cost-effective solution for joint preparation

PEF Backing Rods (PEF Gap Fillers) Packing​

Available diameters:
6mm | 8mm | 10mm | 12mm | 15mm | 20mm | 25mm | 30mm | 40mm | 50mm

Roll lengths:
100m | 50m | 20m

Media & Downloads​

Frequently Asked Questions about PEF Backing Rods (PEF Gap Fillers)

What is the purpose of a backing rod?

Backing rods are used to control sealant depth, support proper joint design, and prevent the sealant from bonding to the back of the joint, which improves flexibility and longevity.

Are PEF Backing Rods waterproof?

They are non-absorbent and moisture resistant, but they are not a waterproofing product on their own. They are used in conjunction with sealants.

Which sealants are compatible with PEF Backing Rods?

PEF Backing Rods are compatible with most common construction sealants, including silicone, polyurethane, MS polymer and acrylic sealants.

How do I choose the correct size backing rod?

Select a backing rod diameter slightly larger than the joint width so it compresses firmly into place without stretching.

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