June 20, 20251 yr The builders if my garden studio have installed osb underlay in top of joists that are spaced around a 50cmx100cm insulation. It took them a long time to build the roof and a lot of rain has fallen on the floor (it was covered but this wasn't enough). Now, the underfloor is squeaking and the side of each board has swelled a bit. They have agreed to add an additional layer of boards before we lay down ufh and lvt. They want to use 18mm osb boards but I read that plywood would be a better option, even 12mm. Should I insist on the plywood or will osb be enough?
June 20, 20251 yr Did they glue the osb down with expanding PU glue? squeaking could be because they didn’t use any and so might still squeak regardless what you put on top
June 20, 20251 yr Author I don't think they used glue. Looking at old photos, it looks like they only used screws.
June 20, 20251 yr 9 minutes ago, Eldad said: I don't think they used glue. Looking at old photos, it looks like they only used screws. That will squeak forever more. Take the OSB off, bite the bullet, or regret it for….ever more. Adding layers = 💰🔥
June 21, 20251 yr 12 hours ago, Nickfromwales said: Oh, and use glue!!!!!!!! yep for a floor with lots of foot traffic glue the joints... For a loft with virtually no traffic just screw (never know when you might need to lift a board for access)
August 12, 20251 yr Author thanks. We added a second layer of OSB (and used glue this time) Let's hope this will last longer.
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