Glossary

Overlap allowance

Extra width added to each side of a sliding gate so the closed gate laps over the post or fence and leaves no gap. Usually 50 to 150 mm per side.

A sliding gate is usually built wider than the opening. The overlap allowance is the extra width added on each side so the closed gate laps past the post or fence and leaves no see-through gap. A common amount is 50 to 150 mm per side.

Without it, the gate would be exactly as wide as the opening, and you would see a slot of daylight down each edge when it is closed.

In CAD60 you set the left and right overlap on their own. Type your clear opening, add the overlap you want on each side, and the gate is drawn at the full width with the overlaps built in.

Related terms

Clear openingThe width of the gap a gate has to cover, measured between the inside faces of the two posts. The first number you take for sizing any gate.
Sliding gateA gate that slides sideways to open, instead of swinging out. Picked when there is no room out front for a gate to swing.
Catcher postThe post on the far side of a sliding-gate opening. It catches the front edge of the gate and holds it straight when the gate is fully shut.

Used in these CAD60 models

Battened Sliding GateParametric sliding gate with a rectangular hollow-tube frame and vertical battens face-fixed to the front. Supports optional tail extension for motor automation and optional L-piece top rail.
Slatted Sliding GateParametric sliding gate with a rectangular hollow-tube frame and evenly-distributed slats. Supports vertical or horizontal slat orientation, optional tail extension for motor automation, and optional L-piece top rail.