Why Does a Driveway Gate Drag Across the Concrete

A gate that clears the concrete by half an inch in April can scrape it by July, and the figures kept at driveway gates round rock energyprocessdevelopments show the pattern again and again on clay lots. A driveway gate in Round Rock, TX drags for one of three reasons: the post moved, the slab moved, or the leaf sagged.

How does clay move a gate post?

Expansive clay soil swells when it is wet and shrinks when it dries, and a post set in a shallow hole rides that movement. One post leans in while the other leans out, and the leaf rubs at the latch side. A leaning post is cured by resetting it deeper, in a concrete footing belled at the base.

Why does the slab matter?

A concrete driveway is poured on the same clay, so a slab edge can lift an inch or more near a heavy tree root or a drainage low spot. The leaf then swings across a surface that is no longer level. Grinding a high spot or adding a few inches of clearance below the bottom rail often fixes it without touching the gate.

Can the leaf itself be the cause?

Yes. A long single swing leaf in light tubing droops at the latch end, and the sag grows every season. A diagonal brace, a heavier frame, or a split into a dual swing pair removes it. Welds should be checked for cracks, since a cracked weld lets the leaf rack out of square.

What goes wrong on a slide gate?

A cantilever gate rides a carriage on two posts, and if one post settles the whole leaf tilts and drags at the tail. A gate that runs on a ground track picks up debris from storms near Brushy Creek and Forest Creek, and the wheels climb out. Both problems are mechanical, and both are measured with a level and a straightedge.

What stops drag from coming back?

Hinges and rollers are adjusted rather than forced, galvanized fasteners replace rusted ones, and the bottom rail is held an inch and a half above the concrete along the whole arc. Powder coat on the frame prevents rust that swells the joints. After the first heavy rain, a recheck of the clearance finds any movement while it is still small.

When is a gate beyond adjustment?

When both posts have moved, when the frame has cracked, or when the slab has shifted more than the clearance allows, the repair is a reset. Posts come out, the footing is redone below the active layer, and the leaf is rehung and squared before the operator is set again.