Ascertaining the thickness and strength of concrete pads to install hoists is extremely important, the minimum thickness of a concrete pad is 150mm 32Mpa.
Most concrete pads are equal in thickness over the entire area of the pad, therefore it is not necessary to drill exactly where the posts will be erected,
A 10mm masonry drill bit can be used in the corner of the pad, and this will give the concrete thickness.
In regards to the strength of the concrete, most pads have a strength of approximately 32MPA ( Mega Pascal ).
Also reinforcing is also very important especially when installing clear floor hoists or higher Safe Working Load (SWL) hoists.
It is also important to use the correct dyna bolts of which the minimum ideal length is between 125mm and 160mm again depending on the hoist model.