Designed for quick installation of purlins between rafters, joists or trusses in post and beam structures. One-piece construction assures a consistent flush fit between purlin and joist or rafter. A reinforced "double lap" seat boosts the load capacity of this heavy-duty purlin hanger. Requires (4) 10d x 1-1/2" nails for header and (4) 10d" nails for each purlin. Features a 1-9/16" top fold; pending IAPMO-ES evaluation.