Retaining Wall Base Width Formula

However in counterfort type wall the base width is kept from 0 5h to 0 7 h in which h is the total height of the retaining wall.

Retaining wall base width formula.

Insufficient stem width resulting in failure or excessive rotation of the stem. 25 mm for each 1 ft 300 mm of wall height for the amount or buried block that is needed. Retaining wall failures are almost always attributable to poor design or poor construction. We recommend making the base twice as wide as the block depth to account for settling.

The footing is usually made of poured concrete but in some situations homeowners may instead opt to simply use tamped earth or a gravel base. Insufficient footing width resulting in rotation or settlement of the wall. The interlocking retaining wall block can be used to build walls up to 24 to 36 inches high depending on the size of the block. Gabion walls 16.

For level top surface the base width of wall is determined in the same way as the cantilever type retaining wall. Width of the base. Height of the retaining wall. Figure a 2 retaining wall geometric variables.

Before we proceed with the design it is important for the designer to know the geometric variable and parameters of the retaining wall. See our retaining wall cost guide to find the average price of a retaining wall. Dig a base trench 24 in. More information on retaining walls where the base trench steps up a slope.

Building codes and retaining walls 5. The retaining wall should be set embedded below grade on a level base of 6 gravel or stone. 150 mm plus an additional 1 in. Cantilevered tilt up walls 13.

Avoid having downspouts pointed at the retaining wall and if it s against the house keep soil and mulch well below the siding. Retaining wall base trench. Estimate the amount of gravel needed to pack the trench at the base of the retaining wall. Counterfort retaining walls 12.

Divide the base depth of 5 to 7 inches depending on the height of the wall by 1 944 to determine the square yardage of the depth of the gravel base beneath the wall. Pier and pile foundations 11. Refer to figure a 2 below. Width of the toe.

If the wall is l feet long h feet high and t inches thick then the trench needs to be l feet long 0 12h feet deep and 2t inches wide. One key aspect of retaining wall construction is preparing a solid footing or foundation. Soil bearing and stability 8. Thoroughly planned and ably performed wall construction will help to ensure the retaining wall s stability.

Designing the cantilever wall stem 9. Follow the block manufacturer s instructions for wall height limits. Preparing the retaining wall base. Thickness of the base.

600 mm wide the length of the wall the depth of the trench will be 6 in. Wood retaining walls 14.