Our I-Joist Anchor features the same features and benefits of our ARSseries of anchors. They fit the two most common size I-Joist 1-3/4 to 2-3/4 in. They install using the drill through method as seen in the picture above and can have backer boards installed for a secure fit. They are compatible with any of our flashing bases and are fabricated out of 11-gauge stainless steel.