Bollard extends almost to the bottom of the footing but does not touch subbase.
Square cuts and cores are usually about 4"-6" wider than footing diameter. Core Drilling costs A LOT more than flat sawing and is only recommended when necessary.
For an anti-ram barricade, the bollards are best installed in a common trench instead of each having an independent pier footing.
WARNING: Distance less than 90 miles from St. Paul is considered local. Please adjust.
Your Address (not necessarily install location)