Footings are a very important part of foundation construction. Footings are typically made of concrete with rebar reinforcement which is poured into an excavated trench.
What is the purpose of footings?
Footings are there to support the foundation and prevent settling, especially in areas of troublesome soils.
The footing is constructed under the foundation for the purpose of distributing the load over a larger area.
Concrete footing should be 100mm deep and 300mm wide for a boundary wall. If you want footing for a retaining wall, however, it should be 150mm deep by 450mm wide.
For larger structures it is advisable to consult a professional engineer for advice on the depth and width of the footing required for the structure.
Allow the concrete to cure for one day before doing any building. It is, however, best to not place any heavy weight on the footing until about 3 days after it has been poured. You can then safely begin construction.
Foundation on the other hand is that part of a structure which is in direct contact with soil and transmits load into it.
Always remember: Footings are an important part of foundation construction, and as such, great care and attention must be paid to the correct procedure required to get the best results.
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