Concrete in Plumbing Rough In Pipe

[Starla Bernhardt]

We are Residential Contractors and we are building a brand new construction home on a slab. After our Plumbers put in our sinks in the Master Bathroom one of them would not drain. Our regular Subcontractor Plumber had sent out one of his licensed helpers to set toilets and faucets and was the one who found the problem. He snaked it and found out there was something in the pipe. The helper Plumber thought it was concrete, but couldn't be sure as he had no camera. He called his boss, our main Subcontractor Plumber, on Thursday. Our Subcontractor Plumber finally got back to us this afternoon. He immediately went to blaming the concerere subcontractors. He said he wanted to fix it, but didn't want to get to it right away. He wants us to wait even though he really is in the middle of the job right now. Not only does he want us to wait, but he wanted to put the expense on the concerete subcontractors. Well, at this point, we do not even know what is blocking the sink from draining. Even if it was concerete, he should have made sure all pipes were covered adequately from any concrtete falling into the pipes. However, at this time, we do not even know what is doing the blocking. 

Right now the floor has to be jack hammered out to get to the pipe which of course also ruins our engineered wood floor. 

We have never had this happen before. Who is financially responsible for doing the work and replacing the engineered wood flooring? 

Any thoughts or experiences would be appreciated. Thanks.