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Table Of Content Signs You Have A Yard Drainage Problem Step 4: Constructing the Beams What Are Pier and Beam Foundations? Ground vibration transfer is also much greater with a slab than a pier and beam foundation. To determine the combined load an individual pier can support, calculate the pier’s horizontal surface area in square feet, and multiply it by the soil capacity in pounds. The larger the horizontal surface and greater the soil capacity, the fewer piers required. Signs You Have A Yard Drainage Problem This type of foundation is advantageous over a slab foundation as it lifts the home above the possibilities of flood and other moisture damage. It also makes access to plumbing, sewage and electrical lines easier in the crawlspace beneath the home. Obviously one of the biggest factors that affects the cost of pier and beam foundations is the size of your home. The national average for pier and beam foundation per square foot is $7 to $11 square feet. Step 4: Constructi...