Retaining walls are a regular part of landscaping used to support the soil and prevent erosion in sloping ground. You can convert an unsuitable slope to a usable tiered garden or a level area on which to place a patio. When landscaping, a consideration in the thoughts of many homeowners is whether or not to include a concrete footing. The answer is not a simple yes or no; it is a question of a number of important considerations, and we can help you make informed decisions at Bill’s Custom Concrete.Â
The Significance of a Strong FoundationÂ
A retaining wall will need to be strong enough to support immense pressure from the soil behind it, pressure that is increased by water and elevation. A footing is part of the foundation of the wall, spreading its load to a larger surface area so it won’t shift, settle, or collapse.Â
For most retaining walls, and particularly for high retaining walls, a solid footing for a concrete wall is not just the way to go – it’s required for permanent stability and security. A wall with a defective base is far more likely to collapse, leading to expensive repairs and possibly harm to your property.
Determinants of the Need for a FootingÂ
There are various considerations that decide whether you require a concrete footing for a retaining wall construction.
Wall HeightÂ
The crucial factor involved here is the height of the wall. A small ornamental garden wall less than two feet high won’t need a deep concrete footing. Walls three or four feet or higher, though, are retaining a lot of ground and absolutely need to be supported by a solidly constructed, engineered foundation to keep on standing. Wondering, do I need a concrete footing for a retaining wall​? If your wall is tall, the answer is likely yes.
Soil ConditionsÂ
The type of soil on the ground is significant. Loose/soft clays or sand soils do not hold and settle readily. In this case, you will have to place a footing for a concrete wall to create a solid base. Solid bedrock or dense draining soil is solid enough to hold a small-sized wall without a concrete foundation.
Water and DrainageÂ
Water is the worst nemesis of the retaining wall. Lack of drainage will result in hydrostatic pressure on the back face of the wall that will exert effect upon it. Areas or sites of increased water tables or rainfalls need a deep foundation, usually a footing made of concrete, to support this thrust and maintain the position of the wall. Knowing the proper retaining wall footing depth is essential for tackling water issues effectively.
Local Building CodesÂ
Check local building ordinances before building. Every city will have a list of ordinances that will pertain to retaining walls, and it will typically consist of engineered drawings and concrete footings on walls four to three feet and above. If these requirements are not satisfied, there will be fines and the removal and reconstruction of the wall accordingly.
Alternatives to Concrete FootingsÂ
Although a concrete retaining wall in Oklahoma City is a popular option for larger walls, there exist additional materials that are applied on small walls that blend into the surroundings.
Compacted Gravel BaseÂ
For low walls, a solidly compacted base course of gravel will generally suffice. This involves excavating the hole to the appropriate depth and bedding it down with a layer or two of crushed stone a few inches thick, and compaction down to a solid level base. This provides ideal drainage, again holding down pressure behind the wall to a minimum.
Geo-Grid ReinforcementÂ
Geo-grid is a stabilizing man-made reinforcement grid that underlies the earth stabilizing behind the wall, reinforced even more. It is spread out in courses between courses of wall blocks and down into the ground.Â
Although typically spread on a gravel base, it provides excellent added reinforcement and can replace a large concrete footing on select projects. Want to know how to build a concrete footing for a retaining wall​? Start by ensuring the foundation is properly prepared with gravel and reinforcement like geo-grid.
How to Construct a Long-Lasting WallÂ
Whether to put a concrete footing on the retaining wall or not will be based on the height of the wall, the type of ground, the problem of drainage, and local building ordinances. Although low walls used just to decorate may be supported when a properly compacted gravel base is used, larger and taller walls basically always should come with a concrete footing to be stable and long-lasting. Contact Bill’s Custom Concrete for tailored advice for your project!Â