Hello Sheraggy! I could not find the instructions that specifically addressed the installation of the pad itself, only the steps. But from all the pictures I saw on-line, they appear to show any bumps or treads facing "UP". I'm assuming it's to ensure adequate traction as everyone enters/exits the pool so they don't slip on the steps. But that's just my guess.
By the way, welcome to TFP! Hope you find the site useful. Have a great day.
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