The HHUS is designed for applications where higher loads are needed. This heavy-capacity hanger features double-shear nailing that distributes the load through two points on each joist nail for greater strength. This feature allows for fewer nails, faster installation and the use of all common nails for the same connection.
"Use all specified fasteners; see General Notes
Joists sloped up to 1/4:12 achieve table loads
When nailing into solid sawn carrying member's end grain, the allowable load is adjusted by a factor of 0.71"