CertainTeed's Vinyl Carpentry Soffits are designed to provide a beautiful finishing touch for porch ceilings and soffit areas, or add a distinctive touch with vertical siding applications. Ironmax is also an ideal product for remodeling. Ironmax soffit and vertical siding is appropriate for use in new construction for single family homes, multi-housing projects and light commercial developments. The vented style is intended for eaves installation only.