grounding electrode system (ufer)

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Section R403 of the 2014 IRC (a building code I have handy) clearly considers a thickened slab edge a footing. R403.1 requires every exterior wall to bear on a footing.

Cheers, Wayne
 
GerryB said:
Could you put a modular home (some are pretty big) on just a 4 or 6" slab?
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petersonra said:
I suppose if the engineer who sealed the drawings said you could.

why would you need a slab anyway?
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That slab possibly has movement with seasons.

I have a client that is planning to get a mobile home, any time now. Instead of just setting it on blocks like many often are, they did pour several piers (presuming they extend down below frost line like a footing would be) and will set blocks on those and anchor it down with typical earth anchors.
 
Dale001289 said:
Semantics perhaps? I believe it meets the intent of the Code.
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I don't see the it meets the intent. In my opinion the intent of the rule that says footings or foundations it based on the fact that these are typically deeper in the earth than a slab. I am not even sure a slab with thickened edges really meets the intent of the section.
 
don_resqcapt19 said:
I don't see the it meets the intent. In my opinion the intent of the rule that says footings or foundations it based on the fact that these are typically deeper in the earth than a slab. I am not even sure a slab with thickened edges really meets the intent of the section.
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If a concrete slab is thick enough, ie contains rebar and is in direct contact with earth (no vapor barrier) why wouldn’t it be sufficient ?


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Dale001289 said:
I stand by my comment - rebar is rebar, concrete is concrete and dirt is dirt - its not rocket-science.
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Then submit a PI for the 2023 code that says rebar in a slab can be used as a grounding electrode. A slab is not a footing or a foundation.
 
A slab that is only a little thicker around the perimeter - might not be a footing, IDK. If it is an 8-12 inch wide trench and four feet deep around the perimeter even though it is all one pour, I think it is a footing at the perimeter and a slab in the middle.

Underground service conductors are not service entrance conductors. But if they pass through a basement wall and into the service disconnect, they become service entrance conductors where they enter the building.

How often do you hear certain analogies to explain how something electrical works? Yet you seldom hear electrical talk as an analogy to explain something else:cool:
 
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