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The Water Cooler
General Discussion
Foundation replacement questions
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<blockquote data-quote="DeeJay" data-source="post: 2736638" data-attributes="member: 35125"><p>^^^^^THIS!!!!^^^^^</p><p>The usual problem is not the foundation or slab strength, or lack thereof. The problem is the soil (red clay) with its huge shrink and swell characteristics. When it swells, it will lift an enormous amount of weight (ie, footings). When it shrinks, it will create cavities under the slab and allow the slab to bow down in the middle or the footing to sink. </p><p>The best answer is usually a good solid footing around with grade beam footings spanning across, all with rebar. And all supported with piers belled at the bottom and with rebar "cages" installed in each one prior to pouring and tied to the footing. Keeping everything from being pushed up is as important as keeping everything from sinking.</p></blockquote><p></p>
[QUOTE="DeeJay, post: 2736638, member: 35125"] ^^^^^THIS!!!!^^^^^ The usual problem is not the foundation or slab strength, or lack thereof. The problem is the soil (red clay) with its huge shrink and swell characteristics. When it swells, it will lift an enormous amount of weight (ie, footings). When it shrinks, it will create cavities under the slab and allow the slab to bow down in the middle or the footing to sink. The best answer is usually a good solid footing around with grade beam footings spanning across, all with rebar. And all supported with piers belled at the bottom and with rebar "cages" installed in each one prior to pouring and tied to the footing. Keeping everything from being pushed up is as important as keeping everything from sinking. [/QUOTE]
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