Re: Noisy floor when walked on. Annoying!!!
I suspect it's more likely loose fasteners, but regardless, the movement in the floor is the cause of the noise. Pull up the carpet and determine the source. If you find loose nails, PULL THEM OUT and install new ring shank nails next to the old locations. Old nails will only loosen again, causing the same annoying squeak. Another problem area, similar to loose nails are what's called "shiners". These are nails that missed or only partially penetrated the structural member below and will always squeak if not removed.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!