- References
{{Notability|{{notability|date=January 2018}} |date=January 2018}}PEF rod or PEF backer rod is a flexible polyethylene foam cylinder that is pushed into gaps where there is a construction joint. The joint is usually filled to level with a viscous sealant to provide weather-proofing. PEF rod typically comes coiled in a box, and comes in various diameters and lengths.[1] As a result of the foam structure, the material is low-density and flexible. References1. ^{{cite web|url=http://mpb.co.nz/product/pef-backing-rod/|title = PEF Backing Rod : Masons|website = Masons Plastabrick}}
{{Material-stub}} 1 : Foams |