Measuring a Gate Opening Before Fabrication

Nothing about a gate opening is as square as it looks from the driveway, and the running record metal gates georgetown three word wednesday holds shows that most fabrication errors start with a tape measure used in only one spot. A metal gate in Georgetown, TX is cut to the opening it was measured for, so the numbers taken on the first visit decide whether the frame hangs true or gets re-welded in the shop.

Where is the opening measured?

The opening is measured in three places: at the top of the posts, at the middle and at ground level. Posts that lean or have shifted in limestone soil give three different widths, and the smallest one controls the gate. A leaf built to the widest number will bind on the latch side every time.

How much gap does the hardware take?

Hinges and the latch each eat a fixed amount of the opening, usually between half an inch and an inch per side depending on the hardware. The fabricator subtracts that from the post-to-post width and then takes off a little more for swing and for expansion of the steel in summer heat. A dual swing pair splits the remaining width in two and adds a center gap for the drop rod and the stop.

What does swing clearance mean on a sloped drive?

A swing gate sweeps an arc, and on a rising drive the bottom rail climbs into the ground before the leaf reaches full open. The measurement that matters is the grade across the full arc, taken with a string line and a level, not just the height at the post. Where the rise is too steep, the choices are a rising hinge, a taller bottom gap or a slide gate with a cantilever track.

Why measure the posts as well as the opening?

Existing posts are checked for plumb on two faces and for depth of the concrete footing around them. A post set shallow in Williamson County clay will move again after the gate is hung, and a frame that sits on it will sag. Posts that fail the check are replaced before fabrication, not after, because the measured opening changes the moment a post is reset.

What gets written down before the order?

A good measure sheet lists the three widths, the post heights, the grade along the swing, the hinge side, the operator location if there is one and the finish. The finish matters at measuring time because powder coat adds a few thousandths to every surface and galvanized steel adds more.

How long does measuring take?

A straightforward single swing opening takes about forty-five minutes with a second person holding the end of the tape. A sloped or curved opening, or one beside an old stone wall near the Georgetown Square, can take twice that.