I am about to lay a solid oak floor in my lounge, dining room and hall. Its about 70 square metres and i have bought 180x3000x18mm planks T&G on all sides. I want to lay the boards in the same direction as the current floorboards (which are only 110mm wide) due to the direction of light coming into the rooms. Had originally thought i could secret nail directly on top but reading a number of threads on this site i now have doubts - How should i lay the floor. Lounge is 7m by 6.5m, longest run will be over 9m through into dining room.