I am not a stranger to minor home work, but this wall has me stumped. I am trying to hang an EV charger and cable hook, which while not huge, are enough I'd prefer them to be in studs. Simple enough, right? Queue this wall.
The wall separates the garage from the home, built 2015. As best I can tell, the wall is either a) a shear wall, b) something additionally insulated for fire code, or c) both. Stud finder, magnet, and tapping (best) are absolutely failing to find studs in most of this thing. The leftmost seam (in red) is definitely a stud. The other painted seams (in blue) have screws but are definitely NOT studs. The wall seems to be double-layered (or bizarrely thick) sheet rock with plywood or OSB backing. Those other visible seams are where the drywall is anchored to plywood, but not an underlying stud. Presumably this has to still be anchored to studs, but not in an arrangement I've seen. From the one I've verified, I've drilled 16" and 24" out and hit nothing, even redrilling +/- 1". Which leaves me with two overall questions:
Where the hell are the studs in this thing? Regardless of the backing screwing up the detection methods, there has to be some kind of vertical framing in there, right? I'm at a loss for how else to find them short of a sawzall.
If I'm mounting something <50 lbs, does it matter? I have to assume the plywood backing is anchored to studs, so using that should be more than adequate. I'm still not sure how best to do that. A lag bolt would grip the plywood, but most of the length would still be in drywall, which seems less than ideal. I'm leaning towards long toggle bolts that I would drill and expand past the plywood.
Any thoughts or suggestions would be helpful.