Floor Squeaks Video

My house was built with prefabricated trusses instead of joists. There is no wood to nail into. Thank you.

J.C. Ratcliffe

That's great when the subfloor is exposed, but I have hardwood in place on 2 levels of flooring.

We will be covering the floor with carpeting, but we are dealing with a wooden floor. Do we have to strip the floor to get to the sub floor or can we just try your idea on the wooden floor? Will it still work>