Floor Squeaks Video
Locate a floor joist by driving a nail into the subflooring until you feel the nail hit the joist. Mark that spot, then find the other edge. Once both sides are found, draw a line the length of the floor. Then you can screw the subflooring down along the floor joist. Use 1-5/8" coarse thread drywall screws for the job, spaced about 4" on centers along the joist.
Tim built custom homes and did ultra-custom remodeling for 20+ years before launching his Ask the Builder media presence. He was selected as one of the Big 50 by Remodeling magazine in 1993. This award gave birth to Ask the Builder in October 1993. Tim also operates https://DrawPlumbingPlans.com. His @askthebuilder YouTube channel was the first home improvement channel on YouTube.
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Tim, what do you do when you have a tri level and the floor on the 3rd level is the one that squeaks and is carpeted?
Ted, you need to do a 15-Minute Consult with me. Look at my cart for that. Lot's to discuss. I just do short pithy answers here.