Mounting Methods

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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.

FLAGPOLE
A
B
C
D
E
F
Exposed
Height
Overall
Height
Butt
Diameter
Sleeve
Diameter
Sleeve
Length
Foundation
Base
Foundation
Top
Base
Plate
20′22′5″8″24″24″30″12″
25′28′5″/6″8″/10″36″24″/30″34″12″
30′33′5″/6″8″/10″36″30″36″12″
35′38 ½’6″/7″10″42″30″36″14″
40′44′7″/8″10″/12″48″36″42″14″/16″
45′49 ½’8″/10″12″/15″48″36″42″16″/18″
50′55′8″/10″12″/15″60″42″48″16″/18″
60′66′10″/12″15″72″42″48″18″
70′77′12″15″84″48″60″20″
80′88′12″15″96″54″72″20″
90′99′12″15″108″60″72″24″
100′110′12″21″120″66″72″24″

Shoe-Base Mounting

This may be used for aluminum poles. It is common to see this type of mounting on poles with lighting fixtures or on roof tops. 3/4″ anchor bolts replace the ground sleeve and are concreted in to the ground or welded to steel structures.

Pole
Diameter
4″5″6″7″8″10″
A5 ¾”6″6 ¾”7 ½”8 ¼”10 ½”
B8′8 ½”9 ½”10 ½”11 ½”14 ½”
C9 ¼”9 ¾”10 ½”11 ¼”12″14″

Mandrel Mounting

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.
A mandrel mounting is used where an embedded foundation is impossible for structural reasons.  Typical uses are on plazas over underground parking areas and building roof tops.