The new T-Form reduces material waste and labor cost in the field. Used in conjunction with the company's iForm, the product's configuration provides easy construction of interior demising walls. It's universal and reversible, and is constructed with two opposing panels of expanded polystyrene held together with polypropylene ties. Designed for use above and below grade, the form allows for rebar to be placed in five different locations within the wall. Reward Wall Systems. 800-468-6344.