This is the part that is most unpredictable. Even though surface earthwork has been done, the engineer can only know the depth of the solid boulders under the build site after digging the soil out. These solid boulders will support the piles, which in turn support the weight of the whole house to prevent cracking and worst, tumbling.
We started with some 2o feet 6 inch reinforced concrete piles. After the 10th feet the piles did not set in but broke on pressure. We wasted 11 piles. After consulting the engineer and changing to 10 feet 8inch piles, luckily everything went well. We need 42 piles for an area of 1500 sq feet.
House built on reclaimed mining pond land sometimes need a few piles in a straight line to touch the solid ground at depth of 80-100 feet. The similar build up area can use up to 4 times more 20 feet piles! So choose your land well.
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