Considering the importance of keeping a launchpad level, were pads 39A or 39B at Kennedy Space Center built with pilings or footings down to the bedrock?
As seen in the quotes below, I have found information on the Vehicle Assembly Building (yes) and on the crawlerway (no), but not on the launchpads. Although I am primarily interested in 39A/39B, other Kennedy or Canaveral launchpads would be appropriate here.
It was decided to support the great weight [of the VAB] upon open end steel pipe pilings, 16 inches in diameter and three-eighths of an inch thick, driving each pile to bearing on the rock formation. Blount Bros., the contractor, required six months, beginning in May 1963, to drive 4,225 steel piles through the upper limestone layer to bedrock. This was the equivalent of 128 miles of steel. [p. 20]
To prepare [the crawlerway] base, more than 3,000,000 cubic yards of fill were dredged from the adjacent barge channel and allowed to compact the subsoil to 95-per cent density, almost the hardness of rock. Six feet of crushed stone was then applied and packed to maximum density. Above this layer is 12 inches of selected hydraulic fill. The bed was topped and sealed against moisture with an asphaltic prime coat and then covered by loose Alabama river rock, eight inches deep on curves and six inches deep on the straightaway. [pp. 33-34]
The Kennedy Space Center Story