Solid wood multi-layer board is a board made of multi-layer wooden boards; If your home is going to install floor heating, you'd better use this kind, which is better than pure solid wood. Because it is breathable.

Solid wood composite board is a board made of many sawdust wastes. A lot of glue is added in the pressing process, and the formaldehyde content in the glue is the most, so if the budget is sufficient, it is best not to choose solid wood composite and reinforcing board.