With the introduction of CertainTeed’s new CertaForm flexible flatwork form, contractors can now more easily tackle curved designs for projects such as patios, driveways and decks. CertaForm is made of cellular polyvinyl chloride (PVC) that does not absorb moisture, is chemical resistant, cleans quickly and does not warp or crack. The product’s durability allows it to be reused multiple times and is easy to transport and store due to its convenient size.