Gate Installation

Gate sag is almost always caused by a hinge post that is out of plumb — typically due to frost heave, uncompacted soil, or an undersized footing. As the hinge post tilts, gravity pulls the latch end of the gate downward. The permanent fix is to re-set and re-plumb the hinge post with a proper bell footing, not to add stronger hardware.

Gate posts must be larger than standard line posts because they carry dynamic load from the gate plus wind loading and leverage forces from gate swing. For most residential gates, a 2.5-inch or 3-inch square steel post is appropriate. For wide or heavy double gates, larger posts (up to 4-inch square) and bell footings are required.

Iowa building codes require pool gates to have self-closing spring hinges that return the gate to fully closed without assistance, and an auto-latching mechanism that engages automatically when the gate closes. The latch must be on the pool side of the gate at 54 inches or higher from the ground so it cannot be reached by a small child from the exterior.