§870.TABLE D. Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 40 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)

    3950

    4650

    5300

    5300

    6150

    7050

    6600

    7700

    8800*

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

    Footing Area (square inches)

    1000

    569

    670

    763

    763

    886

    1015

    950

    1109

    1267

    1500

    379

    446

    509

    509

    590

    677

    634

    739

    845

    2000

    284

    335

    382

    382

    443

    508

    475

    554

    634

    3000

    190

    223

    254

    254

    295

    338

    317

    370

    422

    4000

    144

    167

    191

    191

    221

    254

    238

    277

    317

     

    a)      First footing centered within 2 feet from end of home.

     

    b)*    Individual supports, concrete 8"x8"x16" blocks, shall NOT support loads greater than 8,000 pounds for a single stack and 14,000 pounds for a double stack pier.