Concrete Footing Design

Concrete Footing - Info on building concrete footings including soil assessment, footing dimensions, repairs, spanning soft soil, water excavation, and more

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When designing a structure’s foundation, it’s important to take into account the soil’s bearing capacity when designing the footing. The lower the bearing capacity of the soil, the wider the footing needs to be to offset the reduced capacity.

If the structure is going to reside on expansive soil or soil with low bearing capacity, additional foundation support may need to be designed to prevent structural damage. Deep foundations can minimize or eliminate structure settlements or problems caused by expansive or weak soil.

Concrete Footing Design – Minimum Widths of Concrete & Masonry Footings (inches)

Load-Bearing value of soils (psf)

1,5002,0002,5003,0003,5004,000

Conventional wood frame construction

1-story161210876
2-story1915121087
3-story22171411109

4″ brick veneer over wood frame or 8″ hollow concrete masonry

1-story1915121087
2-story251915131110
3-story312319161312

8″ solid or fully grouted masonry

1-story22171311109
2-story312319161312
3-story403024201715

Table source: Table 403.1; CABO One and Two Family Dwelling Code; 1995

Additional Resources from FEMA’s Foundation Analysis and Design

Reinforced concrete footings are proportioned according to the provisions of ACI 318, Building Code Requirements for Structural Concrete. It is often opined that foundations should not yield, due to the high cost of foundation repair. However, nonlinear soil behavior is common in strong ground shaking, and it is traditional to design foundations for the reduced forces computed with the response modification factor, R, used for the superstructure. Neither the NEHRP Recommended Provisions nor earlier model building codes required the use of amplified forces for foundation design.

JES Service Area Map

Service Areas

HAMPTON ROADS & NE NC

1741 Corporate Landing Pkwy
Virginia Beach, VA 23454

NORTHERN VA & DC

8122 Bethlehem Rd
Manassas, VA 20109

MARYLAND

1250 Reames Rd
Middle River, MD 21220

CENTRAL VIRGINIA

2410 Southland Dr
Chester, VA 23831

WESTERN VIRGINIA

456 Old Courthouse Rd
Appomattox, VA 24522

SOUTHWEST VIRGINIA

1401 Southside Dr
Salem, VA 24153

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