Quote Originally Posted by MudRunnerTD View Post
Looks like half a brick so your 50mm. So Yellow Tongue is 19mm board. Down on 30mm Battens will get you your 50mm. 100% batten it out mate.
The issue with battens is the sound and feel difference under your feet from one room with battens to the next room with a solid base. I helped a mate years ago do similar, while he was happy with the outcome, you could hear and feel the difference, as it was hollow under the foot.
But. Its worth thinking over. I will see how much it will be for half a cube of conc to do it and think about it.