Pro Tip: When building a standard 1.8m high fence line, you should set this 2.4m post roughly 600mm into the ground. Dig your post hole approximately300mm wide to ensure a robust concrete envelope entirely surrounds the timber base.

Critical Step: If you cut the post to length or square off the top, always apply a dedicated end-grain preservative fluid (such as Ensele or a similar brush-on treatment) to the freshly exposed wood fibers. To maximize the life of the post, never bury a cut end down into the soil—always keep the original factory-treated end at the bottom of the hole. Use 1.5 to 2 bags of rapid-setting Postcrete per hole for an instant, immovable anchor.

Pro Tip: To maximize the high wind-resistance of this rectangular post, always install it with the wider 125mm face pointing down the line of the fence (perpendicular to the panels). This alignment uses the post’s maximum structural depth to fight wind leverage.

Critical End-Grain Rule: To build a stable 1.8m high boundary, set this 2.4m post roughly 600mm deep into a 300mm wide hole filled with rapid-setting Postcrete. If you cut the top of the post to form a weather-shedding slope or point, you must apply an end-grain preservative fluid to the raw wood fibers immediately. Always keep the uncut factory end at the bottom of the hole to protect the base from underground rot.

Pro Tip: To maximize the high wind-resistance of this rectangular notched post, always install it with the wider 125mm face pointing down the line of the fence (perpendicular to the panels), ensuring the V-notches face outward toward the front of your boundary line.

Critical Sizing & End-Grain Rule: To build a stable 1.8m high closeboard boundary, set this 2.4m post roughly 600mm deep into a 300mm wide hole filled with rapid-setting Postcrete. If you trim the top of the post to form a custom weather slope, you must apply an end-grain preservative fluid to the raw wood fibers immediately. Always keep the uncut factory end at the bottom of the hole to protect the base from underground rot.

Pro Tip: Because an 8″ x 8″ gate post carries exceptional rotational and lateral leverage, a standard narrow post hole will not cut it. Skimping on the concrete foundation is the number one reason heavy gate setups fail.

The Professional Method: For a 2.4m post supporting a standard 1.2m to 1.5m high gate, you need to sink exactly 800mm to 900mm of the post straight into the ground. Dig a wide hole measuring at least 450mm x 450mm square. Pour a 2-inch layer of dry gravel at the bottom for drainage, sit the post in place, and brace it perfectly plumb. Fill the hole using 3 to 4 bags of rapid-setting Postcrete, layering it with water. Slope the top of the finished concrete plug away from the timber to stop winter puddles from pooling around the post base.

Pro Tip: Sinking a 150mm square structural post requires a substantial foundation footprint to properly anchor its weight capacity and resist wind leverage.

The Professional Method: For a standard installation, dig a hole measuring at least 350mm to 400mm wide by a minimum depth of 600mm to 750mm deep. Drop a 2-inch layer of gravel or drainage ballast at the bottom of the hole to allow moisture to drain cleanly away from the base-cut end-grain. Position and brace the post completely plumb. Fill the void using 2 to 3 bags of rapid-setting Blue Circle Postcrete, layering it with water according to instructions. Use a trowel to taper the top of the concrete wet mix into a smooth, downward-facing dome above ground level, forcing rainwater to shed completely away from the timber base.