The Simpson Strong-Tie® Strong-Wall site-built portal frame system (PFS) provides Designers, builders and contractors in prescriptive markets with an easy way to meet code-required wall-bracing requirements with narrow wall widths. The PFS double-wall portal frame kit provides all the necessary hardware to build a double-wall portal frame system. Simple and quick to install, the PFS is a cost-effective alternative to IRC braced-wall solutions. Strong-Wall® Site-Built Double Portal Kit (Pack of 33).