Grounding steel in tilt up wall construction

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engprosinc

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The steel columns in a tilt up wall building are not buried in the earth. They are bolted to concrete pada. The steel roof decking sits on top of the concrete tilt up walls. My question is how would you ground the roof deck as well as the framing steel?

My question is based on a new tilt up wall building that called for grounds to building steel, cold water pipe and ground rods. The building concrete is finished. All walls are up. They are starting to put the roof decking up. The only ground that was installed is in the electric room, and that consists of ground wires to the rebars. I am not sure if there is any ground to the cold water line.

Several transformers will be located throughout the building, each requiring a ground. The AHJ is asking the contractor how he will ground the building steel, roof top units and transformers. I think the EC is stuck.

Any ideas will be appreciated.
 
Is there any requirement to bond isolated sections of building steal?

Or the bond the roof?

As far as RTUs they will be grounded via the EGC with the circuit feeding them.


As far as transformers they will have to be treated as they would be in a wood building, a GEC will have to run to the buildings grounding electrode system.
 
engprosinc said:
The steel columns in a tilt up wall building are not buried in the earth. They are bolted to concrete pada. The steel roof decking sits on top of the concrete tilt up walls. My question is how would you ground the roof deck as well as the framing steel?

My question is based on a new tilt up wall building that called for grounds to building steel, cold water pipe and ground rods. The building concrete is finished. All walls are up. They are starting to put the roof decking up. The only ground that was installed is in the electric room, and that consists of ground wires to the rebars. I am not sure if there is any ground to the cold water line.

Several transformers will be located throughout the building, each requiring a ground. The AHJ is asking the contractor how he will ground the building steel, roof top units and transformers. I think the EC is stuck.

Any ideas will be appreciated.
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250.104 (D) (1) and (2) will comply with what is needed.
 
iwire said:
True, but lets not forget, Where exposed structural metal that is interconnected to form the building frame

Random pieces of steel are not interconnected to form a frame.:)
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Without a picture of the building it is the closest thing that I thought would work.

I am taking a WAG that it is interconected and the water main should enter the building and there is already a UFER all to be bonded together
 
Gregg Harris said:
Without a picture of the building it is the closest thing that I thought would work.

I am taking a WAG that it is interconected and the water main should enter the building and there is already a UFER all to be bonded together
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You are right, without a picture we all have our own mental image of what the building is like. :)
 
So if the steel in the tilt up is structural steel, and is bolted to the steel roofing framing, bond to whatever is easiest to bond to - probably the roofing framing, and the rest is all bonded together via its own mechanical fastening means, or am I missing something?
 
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