Overhead wooden floors are generally fixed with keel, and now light steel keel is used. The principle is to put a keel at a certain distance below and fix the floor with steel clips. Advantages: Suitable for all floors (solid wood, composite). The disadvantages are: first, the coefficient of thermal expansion and cold contraction of steel keel and floor is different, and the phenomenon of seam stretching will occur after a long time. Second, the steel keel has a certain height, which virtually reduces the housing space. Third, there will be a creaking sound when you step on it, especially at night, which is ugly.
Solid wood flooring is generally laminated wood flooring, each floor has a lock and can be connected, and the expansion coefficient of laminated wood flooring is stable and can be directly laid on the ground. There is also the tenon-mortise structure solid wood floor of Tian Ge brand, which adopts the national patent technology and is inspired by the tenon-mortise mosaic technology of ancient solid wood furniture. Each floor has a lock, and most floors are paved with I-shaped, which is equivalent to 6 floors connected to it. It is very fixed, and there will be no seam, which is convenient to install. If possible, it can be reused.
I hope I can help you. I used to make floors, then tiles, and now I'm doing home improvement, hehe.