Expansive clay soil problems in Arizona
Poor soil conditions in the excavated area cause compaction and can make it difficult to dig out foundation depths that are deeper than the top of the soil. Subsoil cracks are formed when the base of the foundation is deeper than the top of the soil. The loose soil and compacted soil meet at the foundation and will cause foundation heave. A foundation inspection is required before any excavation begins to prevent heaving and cracks in the future.
In order to prevent or reduce the likelihood of foundation heave, every owner should take steps to improve soil conditions. Before digging, owners should remove soil from the excavation. This will help decrease the likelihood of foundation heave.
Additionally, it is important to use good quality clay soil mix when excavating. Clay soils are stronger and require less compaction. By using high quality soils, the property owner ensures a sound foundation.
After removing the old soil, good quality clay soils will be necessary for foundation repair. This should be done before excavating is begun. It is best to consult with a qualified foundation specialist to determine the best clay soils to use.
Quality soil will need to be added to the foundation excavation site, after soil has been removed and for the remainder of the excavation process. Foundation engineers recommend adding a 10 percent grade to provide extra support to the new foundation structure. To help add to the strength of the soil, the grade should be evenly distributed throughout the site.
Using the appropriate soil will also allow the new foundation to drain properly. Seeping into the crawl space is not a wise foundation practice. If proper drainage is not provided, foundation heave will likely occur. Foundation engineers recommend using gravel which is low in water-retention capacity and can be sprinkled throughout the site.
Too much expansion or contraction of the foundation can result in foundation heave. By using the right combination of quality soil and appropriate fill, excavation will be easier and foundation repair can begin before any soil or ground is removed. Choosing the right fill will help ensure a stable foundation.
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