My guess is he added one big planar map to the entire floor, set to the uv channel to 2. Made a blend material. One with the normal wood, the other with the painted wood. Finally the mix map would be the Alpha pattern set to uv channel 2.
Max's blend materials works good, but its somewhat of a nuisance that it creates two standard materials every time you make one. Having to plug your corona materials is time consuming. Also if you have more than one blend materials blended together, navigating becomes pretty crazy.