Foam Bottom?

I have decided to do the foam floor and cove. I am going to use 1 inch. Just not sure if I am going to get tongue and groove or square edge. Installer said square edge is fine but I am thinking a tongue and groove would interlock better. Did you use duct tape, Gorilla Tape? I read that Tyvek tape is very good and is thinner and may help with show thru.
 
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