Bosch 11335K - 35 lb. Demolition Breaker Hammer Installation Manual download pdf (Page 5)

Diamond Pier

Installation Manual 5

CONDITIONS AND USES

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.

For residential applications the two most common prescriptive bearing soil types relied upon in the IRC

table, and in most local codes, are 2000 psf sands/gravels and 1500 psf silts/clays. Diamond Pier

foundations sold through retail outlets must be founded in soils with a minimum 1500 psf bearing

strength. Supporting soils that do not meet the presumptive bearing strength defined in the applicable

code for your area will not provide expected foundation capacity, and their bearing capacity may need to

be determined by a soils investigation. Ask your local code official for soil information regarding your

site. Additional soils information may also be available at the U.S. Geological Soils Survey website

managed by the U.S. Department of Agriculture—see http://websoilsurvey.sc.egov.usda.gov/.

Supporting Soils

Some soils may not be appropriate for supporting Diamond Pier foundations. Some examples include

soils that are weaker than 1500 psf, soils that are highly expansive, shifting or sliding soils, soils on

slopes greater than 2:1 (27 degrees), contaminated soils, or soils where traditional concrete piers,

accepted by local codes, are unable to provide adequate bearing to support the loads of the project or to

protect the structure from the negative effects of frost heave. Where unsound soils exist, a registered

design professional may be required to review the project.

Soils can also be weakened when they retain standing water or are improperly drained, and in certain

types of soil this can also cause heave problems. A site depression with standing water or the potential

for water to pond, pool, or saturate the soil may be an indication that the soil is not sound. Downspouts

that discharge at or near a foundation may also cause soil problems, and setting the Diamond Pier

foundation system adjacent to or near drainage ditches, creeks, or ponds should be considered

carefully. Soils adjacent to existing foundations may also have been improperly or loosely backfilled,

which may cause poor drainage or poor soil conditions. Check your local code for drainage requirements

in and around foundations. .

Please contact PFI if you have any questions regarding your project or soil conditions, and/or the proper

use of the Diamond Pier product or "Residential Diamond Pier Load Chart," provided in Table 1.

WARNING: You must check for underground utilities and follow the instructions described

under the “Locate Buried Utilities” subsection (page 8) before Diamond Pier

foundations can be installed.

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Bosch 11335K - 35 lb. Demolition Breaker Hammer Installation Manual Page 5