Foam expansion jointing is ideal for use when laying concrete on either horizontal or vertical surfaces. This Polyethylene Foam Expansion Jointing can be cut to suit your exact needs, so you can use it in both interior and exterior jobs. Foam joint is a closed cell, cross linked 100% polyethylene foam expansion joint and space filler strip. Foam joint is compressible, even under light loads, and has excellent recovery properties. Foam joint is non-absorbent and is totally impervious to fluids This is essential if the filler is to full fill its proper function Foam joint is used as a gap filler, back up strip and bond breaker.