Inground flagpoles are flagpoles that are planted in ground. This is a permanent flagpole that can click reference withstand wind speeds up to 130 mph. It depends on the flagpole’s height and materials. Foundations are required to install inground flagpoles.

It is done by digging a hole, wetting the soil, then pouring concrete. After the concrete has cured, a cylindrical groundsleeve or “groundsleeve”, can be placed. The groundsleeve (a thick steel cylindrical with an open top, and a large bottom) is used to protect the flagpole from the concrete’s corrosion agents. The outside of the groundsleeve are steel plates that hold it in place. The interior of the groundsleeve is lined with steel wedges that firmly center the base of your flagpole. Groundsleeves usually include a ground spike for lightning. But, if your flagpole’s fiberglass, this might not be a problem.

Foundations may include flash collars. These collars give the foundation a finished look by covering the ground sleeves and bottom of the pole. The space between collar and pole is sealed to keep water away from the base and collar.

Your foundation should be sufficiently deep to allow the flagpole below the ground. This will stop the flagpole from tipping over. Keep in mind that no more than 10% of the pole’s length should go underground.

For larger flagpoles, professional assistance may be needed. Ask the distributor or manufacturer to arrange for free installation.