R-Tech® Fanfold Roof Underlayment is a high-performance cover board consisting of a superior closed-cell, lightweight and resilient expanded polystyrene (EPS) with advanced polymeric laminate facers. R-Tech Fanfold Roof Underlayment is ideal in recover applications, and is well-suited for single-ply roof applications that employ mechanically fastened or ballasted TPO, PVC, EPDM and CSPE membranes. For more information, visit www.insulfoam.com.