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26.08.2015
This article defines retaining wall, barrier or privacy wall, and key retaining wall terms such as wall surcharge and types of retaining wall construction. This article series describes types of privacy walls, retaining walls and retaining wall guard railing requirements, guard railing construction and building codes, and critical safe-construction details for retaining wall guardrails. Our page top photo illustrates a serpentine brick barrier or privacy wall on the Vassar College campus in Poughkeepsie, NY. Retained Wall Height at a retaining wall is the vertical distance measured from the bottom of the footing to the finish grade at the top of the wall (i.e. Exposed Retaining Wall Height at a retaining wall is the vertical distance measured from the finish grade at the bottom of the wall (i.e. In areas where the footing for a retaining wall is below the frost line, there may be considerable difference between the retained wall height and the exposed retaining wall height. Retaining Wall Surcharge [loading on a retaining wall] is a vertical load imposed on the retained soil that may impose a lateral force against the retaining wall in addition to the lateral earth pressure of the retained soil. Our retaining wall photo (above left) illustrates a retaining wall with a higher than anticipated surcharge from soil, piled-up snow when the driveway and parking area were snow-plowed, and vehicle loading.


Frost push from water behind this inadequately-drained retaining wall added to the lateral or horizontal force and had caused recurrent cracking, stone dislocation, and wall creep.
Solid fences that are attached (or directly adjacent) to a retaining wall also impose additional lateral forces on a retaining wall when wind pressures act on the fence. Additional loads from water and frost [added by DJF] in wet or freezing climates may not be considered retaining wall surcharge by some engineers but they are certainly added forces on the wall. Our sketches below, adapted from Folsom CA building department drawings, illustrate the differences in how a segmental gravity retaining wall and a cantilevered retaining wall are supported. The segmental gravity wall depends chiefly on gravity - the weight of the stacked wall segments, to keep the wall in place and to hold back the earth load behind the wall. In contrast, a cantilevered retaining wall depends on the stability of its footing, possibly anchors into the soil behind the wall, and its internal strength or reinforcements to hold back the weight of earth behind.
In both segmental gravity and cantilevered retaining walls, good design provides for the drainage of water that may otherwise accumlate behind the wall. But segmental gravity retaining walls, built usually of dry-stacked (sometimes interlocking) blocks or stones, will typically drain between the individual segments, while a solid or concrete cantilevered retaining wall will most likely require an overt provision of through-wall drainage by weep or drainage openings.


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This wall depends on its footings and wall top surface seal to protect the wall from frost damage. Wet weather and frost can add enormous additional surcharge to a retaining wall, particularly if adequate drainage behind the wall was omitted.
You can see that a segmental gravity wall is usually built staggered design, leaning back into the hill for added strength.
This is the height referred to in UBC ยง106.2, item 5 and it includes the wall and depth of footing below grade.



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