What mm underlay is best for stairs?

We've done some DIY flooring jobs myself in the past, but we've always avoided stairs ourselves. I want to give them a shot this time around, but just a bit unclear on the mm of the underlay or whether underlay should even be used?

Asked by Akinfolayan on 5th Mar 2026
Expert Trade Answers
"I would suggest using a dense 9mm foam underlay on your stairs . It will give you the comfort but without to much movement. Make sure you staple it on well so it doesn't slip"
Answered on 5th Mar 2026 - Member since May 2020 - report
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