Corrugated Steel Ground Sleeve
The most common flagpole installation is a direct burial in to the ground. Standard ground set flagpoles are available in 5′ increments ranging from 15′ to over 100′. The general rule is that 10% of the exposed height is buried in the ground. In other words, a 30′ flagpole is really 33′ overall putting 3′ of the pole in the ground. The ground sleeve is made of a 16 gauge corrugated galvanized steel tube. On the inside, at the bottom, 4 steel wedges are welded to center the pole upon installation. A 1/2″ steel base plate is welded to the bottom with an 18″ length x 3/4″ diameter steel spike attached to act as lightning protection.
Foundation Dimensions – Dimensions shown are the minimum recommended for foundations “under normal soil conditions.” This suggests; good, firm, dry soil. If you have questions, consult with an engineer in your area.
The mounting consists of a mandrel machined to fit the internal diameter of the flagpole and welded to a heavy steel plate. This type of mounting is always custom engineered to accommodate any size poles.