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That would be 22 for a 10 wall and so on.
House footings dimensions. You can look up the recommended footing size based on the size and type of house and the bearing capacity of the soil see the table above. Divide the cubic feet by 27 to convert to cubic yards. A footer that is too small will crack and potentially render the foundation. For example a two story house on moderately strong soil should have a footer that is at least 12 inches in width to give the house the stability it needs.
But the lightest buildings on the strongest soil require footings as narrow as 7 or 8 inches. As you can see heavy houses on weak soil need footings 2 feet wide or more. Much smaller footers as low as 7 inches can be used for a small one story house if the soil is strong or densely packed and will not budge under heavy weight. The footing must be wider than the wall by 6 on each side.
Under every house is a foundation and under most foundations are footings. Footings used for a structure are known as a spot footing or a continuous spread footing. Footings should extend to a minimum depth of 12 inches below previously undisturbed soil. Twenty inches would be a better width.
Your existing footing is not substantial enough footings need to be 600mm wide x 1m deep minimum in some cases depending on ground quality type proximity of large trees footings are required to be up to 2m deep for good impartial advice speak to your local building control office hope this helps. The thickness of the footer is a function of the weight of the structure above and the strength of the soil below the footer. As you can see heavy houses on weak soil need footings 2 feet wide or more. Under an 8 inch thick wall that s the same as saying you have no footing.
The foundation is then constructed on top of the footer. But the lightest buildings on the strongest soil require footings as narrow as 7 or 8 inches. Footings should have a minimum width of 12 inches. Most of the time we take footings for granted and usually we can.
Footings also must extend at least 12 inches below the frost line the depth to which the ground freezes in winter or must be frost protected. A footing is the cement slab that is used to support a structure. A thicker footer 10 12 will be stronger than a thinner 6 8 footer. Under an 8 inch thick wall that s the same as saying you have no footing.
You can look up the recommended footing size based on the size and type of house and the bearing capacity of the soil. Generally speaking the footer is constructed independently of the. How to calculate footing size by cameron easey hunker may earn compensation through affiliate links in this story. Special load conditions may require design by a structural engineer.
The footings are generally a minimum of two to three times wider than the width of the foundation wall. Home hacks answers. The footer is usually installed immediately after excavation. Footing depth can be confused with the.
For typical soils a common 16 or 20 inch wide footing can more than handle the relatively light weight of an ordinary house. What is the best depth for a footing. Special outdoor projects. Click here to get free fast bids from local footing and foundation contractors.
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