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A question for you concrete experts....
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<blockquote data-quote="novatech" data-source="post: 818627" data-attributes="member: 5494"><p>Ok I'm not a concrete contractor. I was. What I do now is work for engineering companies doing forensic examinations on why concrete structures failed. I formulate a plan to repair them. Then my company does the repair if we are the low bidder or they just want us to do it which is usually the case. At present we are working on 2 churches.</p><p>I have no doubt that what has been suggested will work and is what is usually done in the area you live in. But what is done on one piece of ground will not necessarily work on another piece of ground. The man has a gravel sand and clay mix. The ratio is not known. The depth is not known. The type of clay is not known. The depth of the water table is not known. With all these unknowns how can one possibly know what the foundation design should be?</p><p>As far as erosion is concerned, What you see on top of the ground is one thing and usually the only thing people address. Where sand is concerned it is more as to what is happening underground where you cannot see. </p><p>What is the gain in going to 8" of concrete over 4". It is a common misconception that thickness adds strength. The more concrete, the more weight, the more steel necessary to overcome the additional load. In this area for 8" we use a double mat. For your area and your soil a, single mat may be all that is required.</p><p>Anther difference is the use of a footer vs. a beam. Here a beam is where the vertical gives it strength and the width gives it the load bearing on the soil. Usually 1' wide and height to be determined as per load. The steel sized accordingly. In other areas footers are used where the base is usually wide and not so much depth. The soil is not as load bearing. And again the steel is calculated accordingly.</p><p>Here often times we must use deep bell bottom piers to keep the foundations in a level plain. In other areas it is not necessary.</p><p>I have never seen any harm caused by using a moisture barrier. Somebody needs to explain that a little better. Every foundation in this area gets it. It is in every building code I have ever seen. But I don't get out much.</p></blockquote><p></p>
[QUOTE="novatech, post: 818627, member: 5494"] Ok I'm not a concrete contractor. I was. What I do now is work for engineering companies doing forensic examinations on why concrete structures failed. I formulate a plan to repair them. Then my company does the repair if we are the low bidder or they just want us to do it which is usually the case. At present we are working on 2 churches. I have no doubt that what has been suggested will work and is what is usually done in the area you live in. But what is done on one piece of ground will not necessarily work on another piece of ground. The man has a gravel sand and clay mix. The ratio is not known. The depth is not known. The type of clay is not known. The depth of the water table is not known. With all these unknowns how can one possibly know what the foundation design should be? As far as erosion is concerned, What you see on top of the ground is one thing and usually the only thing people address. Where sand is concerned it is more as to what is happening underground where you cannot see. What is the gain in going to 8" of concrete over 4". It is a common misconception that thickness adds strength. The more concrete, the more weight, the more steel necessary to overcome the additional load. In this area for 8" we use a double mat. For your area and your soil a, single mat may be all that is required. Anther difference is the use of a footer vs. a beam. Here a beam is where the vertical gives it strength and the width gives it the load bearing on the soil. Usually 1' wide and height to be determined as per load. The steel sized accordingly. In other areas footers are used where the base is usually wide and not so much depth. The soil is not as load bearing. And again the steel is calculated accordingly. Here often times we must use deep bell bottom piers to keep the foundations in a level plain. In other areas it is not necessary. I have never seen any harm caused by using a moisture barrier. Somebody needs to explain that a little better. Every foundation in this area gets it. It is in every building code I have ever seen. But I don't get out much. [/QUOTE]
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