I have a "summer house" in the garden, it's been there years, but the floor has started to fail/rot - I managed to put my foot through it!

I plan to remove the carpet tiles, treat the existing floor boards with anti-rot stuff, and then put additional flooring over the top to give new stability.

Is this a good idea? What new flooring would be the best value option? I've been looking at P5 T&G chipboard, regular chipboard, plywood, etc.

  • What is the base underneath the floor? Concrete? Pressure treated wood? Something else? If existing boards are actually rotting then they need to be replaced, not just treated. Apr 19, 2020 at 17:21
  • There are "joists" of (what I assume is) pressure-treated wood, which sit directly on a concrete base. Then the floor is (again, what I assume is) pressure-treated wood boards on top. The "joists" are fine, just a couple of the boards are rotted a bit. I've replaced the section I put my foot through, but there are a couple of other weak-feeling sections, so I'm hoping to shore the whole thing up.
    – xorsyst
    Apr 19, 2020 at 17:28
  • Best bet is going to be replace more rather than less. I know it costs more now, but since you have an additional covering (carpet, unlike a deck that is typically open), damage will be hidden and you won't see the progression until it gets really bad again. Apr 19, 2020 at 17:30


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