my home was built in 1892. The fireplace was a coal burner that has since been replaced by a propane fireplace insert. I want to mount a TV above the fireplace but am uncertain as to what is behind the wall. The floor dimensions of the fireplace are about 60"x 30" and the coal burning hearth is much smaller and shallower than this structure built around the chimney. Having had a picture mounted, it revealed horsehair plaster for certain and I am sure I hit a lath slat as the nail was springy in my first hole. When I run a stud finder over it, I get some strange arrangement for supposed studs. From the corner, I read about 9" to first "stud" then 15" then 12" then 15" then 9" to other edge... it is 60" wide... stranger still that the center span is only 12" and not wider given the chimney behind.
Does this make sense for studs or is it some kind of thin strapping to attach the lath to?
I haven't started drilling pilot holes but that's my next step. I guess I am looking for some guidance before embarking on this project.