Abstract: A panel system is provided to form a barrier and an enclosed cavity for spraying foam insulation. The panel system may use panel sections removably attached together to achieve a desired length. The panel sections are attached to wall studs and foam insulation is sprayed into the resulting cavity. After the foam has reacted, the panels may be removed and reused in another section. In one embodiment, a plastic sheet is used as a barrier between the panel and the foam insulation, which sheet can later be removed.