Alcot Plastics 1/2" x 4" x 50' Foam Expansion Joint

Concrete expansion joint is made from resilient and flexible polyethylene foam. This foam allows the expansion and contraction of concrete, which often happens with a change in temperature, without damaging the poured surface itself or surrounding structures.
Features
1/2" x 4" x 50'
Extruded polyurethane foam
Manufacturer may vary by store