Identify the one that creaks, determine the cause and start work.
Ways to eliminate creaks
Insert a wooden wedge from below.
This method is relevant in the case of a poorly fixed board. It will help prevent its movement. Score a wedge with a hammer between the creaking board and the beams. It is important not to raise the boards, as they can become above the rest of the floor.
Insert a wooden wedge from above.
This method will save the boards from friction against each other. The wedge made of wood is driven every 150mm into the internal gap until the creak disappears. In the work, a hammer and a deceased or a small metal rod will help.
Fix the boards on top.
To do this, it is necessary to make several additional holes in the “walking” boards above each of the beams. You can fix the boards using long screws. So that they are well fixed importantly to drill holes at an angle relative to each other. Hats of screws are hidden under a layer of putty and polished the surface after it dries.