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I think I created this confusion, sorry. The existing floor in my trailer is 5/8" fir. Under it is insulation that has been compressed between the floor and frame. If you measure all that together it comes out to 18 mm. Marine plywood comes in that thickness so it fit perfect now that the insulation has been removed. Most plywood is not a true thickness it is a fraction like 23/32" or 43/ 64" or something like that. 5/8 and 3/4 do not really exist as sizes even though Home depot will say it does. In the rest of the world a measuring system that is more precise called the metric system is used. This makes it even more confusing for us empirical thinkers.
I would not be surprised if the nyloboard is 23/32" or even closer, 18mm.
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