The first floor is supported on 240mm high wood I-Beams which predominantly run from side to side. They will be covered by 18mm OSB glued to the joists. Gluing increases the stiffness considerably so we should have little or no ‘bounce’ in the floors.
A layer of resilient impact absorbing material is next with a final layer of flooring chipboard to finish.
The gallery in the Great room will be cantilevered out using a continuation of the first floor joists.