Hanging heavy pictures in an old house
I am about to open a photography studio in an old house, built around 1900. I had a local carpenter widen a door for me, and I am kicking myself for not taking pictures of the wall structure, but I'm hoping someone here will be familiar with what I'm talking about.
I think below the sheetrock is a layer of plaster or something, then behind that are horizontal strips of wood, like roughly 2" x 0.5", with more plaster or something between them. I assume there are studs, but don't know how to find them.
I have to hang my work in my showroom, which will be framed pieces, some possibly exceeding 15 lbs. How can I do this? Is there some type of hardware made for this purpose? Or do I HAVE to find the studs? If so, how do I find them?
Someone has mentioned some kind of adhesive plastic hangers by 3M, but I'm not sure if I want to trust those.
I hope someone here can help!!