Failed Installation Today - Stud Buildout Question
My house failed my Tonal installation this morning. My location was okay in terms of required space, but the installer hit sheetrock concrete before he could get the screw all the way in. I went to Tonal’s website for instructions for a stud buildout, but the diagram on the page is broken. I found a diagram by searching around the internet (attached). Can anybody confirm whether this is the correct diagram? Any other support materials or words of wisdom people have would be much appreciated — I am not remotely home improvement savvy so will be hiring a contractor to do this and want to make sure the contractor has what they need to be successful since I will be of no use whatsoever!
Edit: Changed sheetrock to concrete. Upon further investigation, I expect the walls in my basement are concrete and that the stud finder‘s signals were nails instead of actual studs.