§870.TABLE C. Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 30 Pounds Per Square Foot  


Latest version.
  • Section Width (feet)

    12

    14

    16

    12

    14

    16

    12

    14

    16

    Support Spacing (feet)

    6

    6

    6

    8

    8

    8

    10

    10

    10

    Support Loading (pounds per pier)

    3550

    4150

    4750

    4750

    5550

    6350

    5950

    6950

    7950

    Soil's Load- Bearing Capacity (lbs/ft2)

    Footing Area (square inches)

    1000

    511

    598

    684

    684

    799

    914

    857

    1001

    1145

    1500

    341

    398

    456

    456

    533

    610

    571

    667

    763

    2000

    256

    299

    342

    342

    400

    457

    428

    500

    572

    3000

    170

    199

    228

    228

    266

    305

    286

    334

    382

    4000

    144

    148

    171

    171

    200

    229

    214

    250

    286