"Is the lower bearing capacity of fractured bedrock..." Just curious by what rational was the bearing pressure derived? Was there a prelim. geotech. investigation? Also,
if the excavated area is supported on all sides by undisturbed bedrock why aren't the foundation elements suuported likewise?
A 3/4 cushed agg. would be a better choice below the slab. Still though make sure to place a fabric over the rock to prevent leaching away of fill soil. Lastly, the rock should come up at least 1 foot or so over the highest anticipated seepage level. Just for clarification, are there only...
This may seem more expense in the short term, but considering the circumstances it would seem like a better idea to undercut the pads and replace the removed material with an import granular soil. CEtech is correct in that real fine grain soils will retain moisture which can cause heave during...
