Normal Soil Conditions
Diamond Pier foundations sold through retail outlets are designed for projects that are founded in normal sound soils. Normal soils are typical in most residential neighborhoods throughout the United States and are defined in the International Residential Code (IRC) Table R401.4.1. Presumptive Load-Bearing Values of Foundation Materials.
Some soils may not be appropriate for supporting Diamond Pier foundations. Where unsound soils exist, a registered design professional may be required to review the project.
See the Installation Manual for a full description of Normal Soil Conditions
Residential Diamond Pier Load Chart
IAS-Accredited Third-Party Bearing, Uplift, and Lateral Field Tests2
This load chart is intended for simple structures supported by columns, posts, and beams loaded up to, but not
exceeding, the stated capacities. It is not intended for structures with asymmetrical, rotational, overturning, or dynamic
forces. Intended uses are described in section 2.0 of ICC-ES prescriptive bearing evaluation report ESR-1895. For
projects that exceed the capacities or limitations defined herein, or the intended uses described in ESR-1895, contact
PFI for additional information or site-specific capacity evaluation. See also the Use and Applications download.
Capacities shown are tested to a Factor of Safety of 2, and are applicable in properly drained, normal sound soils only,
with minimum soil bearing capacities as indicated. Copies of the field test reports are available from PFI upon request.
See IRC Table R401.4.1, “Presumptive Load-Bearing Values of Foundation Materials,” for a full description of
applicable 1500 psf and 2000 psf soil types. For soils below 1500 psf, or soils with unknown characteristics, additional
site and design analysis is required. For soils above 2000 psf, the values in this chart shall apply.
- All capacities use four pins of the specified length per foundation. Pin length includes that portion of the pin embedded
within the concrete head. See “Check Your Layout” in the Diamond Pier Installation Manual for more information on
pin/pier layout and spacing restrictions.
- For professional engineers designing for short-term transient loads, contact PFI for further information.