Key Features: The PA is a solution for wood-to-concrete and concrete-block connections. To support code requirements, the PA is designed to connect roof purlins to a masonry exterior wall. This purlin anchor features a dual-embedment line that allows for installation in concrete or concrete block (GFCMU). PA 51 in. 12-Gauge ZMAX® Galvanized Purlin Anchor (Pack of 10).