I want to build a bench like this that can open on top to storage stuffs inside
I will use composite decking boards (extra got left over) to build the outside. BUT how do prevent water from getting inside? I could make the top cover using outdoor plywood and put composite deck on top but that would be too heavy for the top to open up. Is it possible to use paper / flashing thing to put in the inside?
So I guess I am thinking about using this membrane but only all small 2x8 section:
But this is Trex RainEscape which could be expensive. Can I use flashing paper or some membrane for tile or roof instead?