I have two issue that needs to be answered.
The background is that the deadlift platform will be located in the backyard placed on brick flooring which will be covered by shelter. The plywood would consist of three 15mm thickness. x 3 so that is 45mm thickness in total.
I am plan on getting a cage that is 220mm by height and do i want to place the cage on-top of the platform but due to the ground and ceiling it will be too tall. I was thinking if i was able to take off the brick flooring and leave the sand and ensure that the ground is flat and levelled for me to put the platform and the cage ontop.
Another issue is that I don't really know what kind of plywood i should be getting for myself, as I have heard OSB is the one to go too, but I have been told other wise to have marine plywood to ensure the wood is stronger and stable due the wood being in the weather more than the OSB