Is tatami platform keel or box? Which one has good heat dissipation and ventilation? Please ask professionals to answer. High score is the answer!

Don't use gypsum board, the ground should be moisture-proof, keel, large core board or solid wood floor, and then put a cushion on it. If it is geothermal, it is best. For example, to make tatami in drifting dreamland, it needs 20 hemp grass, 10 creeping weed and 5 soft vines. It takes 5 minutes to make it on an automatic loom. Hemp grass can be used to fight dragonflies or it can be obtained at the collection point with starfish on the North Island. Creeping grass and soft rattan should be beaten with soft rattan grass, which is about 3 1~35.