I have concluded the first temperature test with my vinyl plank flooring sample. I put it in the fridge to see how much it would shrink, and it did by 2mm.
Now to put it in the full sun all day to see how much it expands.
I did vinyl plank. What a shit show.
Go over your subfloor with a microscope...put down an under layment/padding before you lay it if it's not already padded on the back. No matter how much that moron in the flooring section tells you that you don't need padding...
Every uneven spot you missed, every small furrow, nail heads/screws in the sub floor no matter how flush or countersunk and patched...4 months later and I could see them all. Mine has separated, cracked at a few of the joints, and it scratches so easy it's not even funny.
The only good part about it is that it's extremely easy to trim and cut and it's definitely waterproof.
Good luck.