Average thickness of subfloor

What is the average thickness of a subfloor? And does the thickness needed depend on factors like the size and type of floor being installed among other factors?

Asked by Joyce on 1st Sep 2022
Expert Trade Answers
"Upstairs sub floor of timber should be a minimum of 18mm thick same downstairs unless it is concrete"
Answered on 3rd Sep 2022 - Member since Jan 2019 - report
"Thickness varies but 18mm is good to use. Plywood more expensive but better than chipboard. Will keep its shape and will less chance of being damaged if something is dropped. Another down side is that it will need to be cut to fit but I’d use it every time."
Answered on 1st Sep 2022 - Member since Aug 2022 - report
"Usually 6mm plyboard and depending on the screed can be thicker if needed"
Answered on 2nd Sep 2022 - Member since Mar 2021 - report
"Depends if you are talking wood or concrete substrate. There are lots of variables with both. Different for all types of finished flooring.
Best to talk with a time served professional flooring company like Ashby flooring Leicestershire. Site visit is best way to move forward talking to several different companies / professionals is always best. Imo"
Answered on 2nd Sep 2022 - Member since Jul 2022 - report
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