Simpson Strong-Tie connectors make projects easier to build while making them stronger and safer. They are engineered and tested to perform and are manufactured to the highest quality standards. Whether working on a home project or building a structure to comply with building codes, go with the choice of engineers and contractors, go with genuine Simpson Strong-Tie connectors. Hip corner plates are designed for use on the hip of a roof. These corner plates connect a rafter or joist to double top plates at a 45-degree angle. The HCPs provide resistance to uplift and download forces.