gt272727 t1_ixdq8jz wrote
NYC handyman here. Is it a building like you see in StuyTown? If yes, in the 60s for internal walls they often used wire mesh lathe secured on timber studwalls then sprayed concrete on them and then the walls were smoothed with a layer of plaster. Stud finders are kinda useless on this type of construction. 3" walls are not uncommon in these types of apartments. The plastic expansion anchors work fine for lighter items or togglebolts are a better option for heavier items.
On walls between apartments they used cinder block and a thim layer of plaster over the top.
zeurydice OP t1_ixdsl6n wrote
I'm not in StuyTown, but your description checks out as possibly what's going on here, maybe with a newer layer of drywall slapped on top. Thanks.
Refreshingpudding t1_ixe2eai wrote
That explains so much. I ran into an interior that was really hard to drill into, and it had metal all over the place
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