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Fastflex™ is a closed-cell polyethylene foam isolation joint and expansion joint filler used in concrete construction.

The convenient, pre-perforated tear-off strip incorporated into the product makes it easy to create a void when using cold-applied sealants. Fastflex is particularly ideal for isolation joints accommodating different horizontal and vertical movement between the pavement and a structure.

Video: Fastflex – When you need more flex than Nomaflex


isoflex product with handFastflex (formerly branded as Isoflex) extends the service life of concrete by acting as an insulator in isolation joints and expansion joints while acting as a bond-breaker for sealants.

Fastflex is an ideal choice for concrete isolation joint filler applications around footings, foundations, structures, and curved or round bases and posts.  Typical projects include walkways, parking decks, curbs and gutters, concrete slabs, swimming pools,  and driveways.

This product is a closed-cell polyethylene foam joint filler and is available in continuous lengths in wall thicknesses of 3/8” and 1/2″ and widths from 1” through 6”.

If you need something that is a bit more rigid or you are looking for a product that combines flexibility and rigidity to be strong enough to be used as a form, learn about Nomaflex®

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