Confession time: I salvage wood from old furniture, too.
My neighbor moved out a couple months ago, and I got a lot of good hardwood from the furniture they put on the curb. Normally I do not take the particle board, but this time I kept a couple of MDF bookcases. I will use the MDF shelves in my garage for wood storage.
It takes a lot of time to salvage wood from furniture. You must also be very careful to find all the nails, screws, staples, and other hardware. If you miss one, you could easily nick or damage your blades when you use the wood, negating all your hard work. Some people use metal detectors to find hidden metal. So far, I have gotten away with very careful work.
A house burned down in our neighborhood. I saw a lot of potential to collect 1950s pine beams and boards and stuff. A retired fireman here on Woodworking Talk warned me to stay away from it. He said that it is impossible to get rid of the smoky odor in the wood. Worse yet, he said that fires release large quantities of toxic chemicals that get absorbed by the wood. In other words, stay away. So I did.
P.S. My spouse would not let me cut up one of the tables I brought home from a neighbor's curb. She may actually use it for sewing and crafting someday. I disassembled it and tucked it away for the future. If she changes her mind, then I can cut it up later.
Last edited by Tool Agnostic; 08-17-2018 at 10:13 AM.