An inground flagpole refers to a telescopic flag pole that is planted in the ground. It is a permanent flagpole that can withstand winds upto 130 mph depending upon the flagpole’s height and material. Foundations are required for inground flagpoles.

The foundation is created by digging a trench, wetting the soil and pouring concrete. In the concrete, a cylindrical “groundsleeve”, or “groundsleeve”, is then placed. The groundsleeve, a thick steel cylinder having an open top with a large base, is designed to protect the flagpole the concrete’s corrosive agents. The groundsleeve is secured in place by steel plates on its outside. The groundsleeve’s interior is lined with steel wedges which firmly center your flagpole’s base. Groundsleeves are often equipped with a ground spike to channel lightning. However, this is not necessary if your flagpole is fiberglass.

Flash collars may also be included in the foundation. These are designed to cover the pole’s bottom and ground sleeve, and give it a finished look. To keep water out of the foundation and base of the flagpole, the space between the collars and the pole is sealed. Your foundation should be deep enough to allow the flagpole to reach underground. This will prevent it from tipping over. It is a good rule of thumb to ensure that 10% of the pole’s length is underground. Installation of larger flagpoles may require professional assistance. Ask the distributor or manufacturer whether they will install it free of charge.