Traditionally, the best method of installing a solid timber floor is to glue and pin the floorboards onto sheets of ply wood. There are several benefits to this type of installation; Firstly, it helps protect the timber from moisture in the sub floor, Secondly, it helps hold down the floor-boards and thirdly it helps minimise the affect of undulations in the sub floor. However, Bamboo is better suited to direct stick installations because it is 15mm thick, more resistant to moisture and movement, and the gluing techniques we use minimise the undulations in the sub floor. Also the way the Bamboozle® boards are manufactured with the cross laminated centre layer effectively reproducing the benefits created by installing boards onto ply wood. Therefore there is little benefit in installing Bamboozle® floor boards onto plywood, unless of coarse your sub floor is unsuitable for direct fixing.