What size and how deep should a concete base be for 26' aluminum flag pole? Pole base ground level.?
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Answers:
You would need to go 4 feet deep to be safe from frost and maintain stability.Normally a 2x2 foot square x 8 inches thick base with a 16x16 pillar on top. However depending on your location and wind and soil conditions you could get away with downsizing to a 16x16 inch base with a 12x12 inch pillar.
I would say about 4 feet deep, and about 3 feet wide, to counter the weight and movement of pole.
assuming the pole is no larger than 6" in diameter. you will want the base about 36" into the ground with the hole for cement measureing at least 20" across. This will do the trick.
Scientifically, weigh the pole you are sticking in the ground. Dig deep enough to put that amount of weight in cement below 6" depth in ground. This is the formula used for the Space Needle in Seattle. The center of gravity is actually one foot below the ground level.
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