Keel, a building material used to support the molding and fix the structure. The keel is the skeleton and substrate for laying wpc decking and is very commonly used.
1、waterproof and moisture-proof, otherwise the floor is in direct contact with the floor, it is easy to rot
2、 easy to construct, if done directly on the foundation, then the requirements of the foundation is quite strict, must make the foundation do quite flat, otherwise not easy to install, and directly installed on the foundation, need expansion screws fixed, not conducive to aesthetics
3、you can use the keel to adjust the height difference