The floorboard flooring is produced with boards of no more than 15 cm wide. You should not use wider boards for this purpose, since they very much begin to warp, even with a slight change in humidity in the room. It is best to select boards so that their length coincides with the length of the room. If the length is more than two meters, working alone becomes quite problematic, so you need to attract an assistant. If the room is so long that it does not go out to choose boards of suitable length, then the floors are covered from the available material, but in this case you will have to ensure that the joints of the boards fall on the beams on which they will lie.
The easiest way is to collect the floor from the downstone boards, the wiped boards are permissible only in the most extreme case, since they are much more often than the dinished. Drowned boards are sold from 1 to 5 meters long, so if necessary, you can choose a material that matches the length of the room. When calculating the total amount of material necessary for flooring, they remember that it must be taken with a margin of about 10%, which will go to waste.
If between the beams the distance is approximately 400 mm, then the thickness of the boards can be taken equal to 18 mm. With a greater distance, take boards with a thickness of 21 to 25 mm.
Paul boards are laid at right angles to the beams. The first board is laid in such a way that it can block the entire room with gaps in end parts of several millimeters. They put a plate of chipboard on the beams, stand on it and proceed to laying the floor.