Conservatory floating floor - Chipboard, OSB, or ply?

3 May 2017
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United Kingdom
I'm in the process of having a conservatory built. The floor slab is comprised of 100mm of polystyrene, damp proof membrane, and approx. 100mm of concrete. According to the guys constructing the conservatory the concrete is ready for me to install whatever flooring I'd like.

I want to have the conservatory floor level with the house floor, so there will be an extra 50mm of polystyrene on top of the concrete. I'm probably going to fit either an engineered wood floor or click together vinyl. The builder won't add any more concrete as that would bring the concrete above the house DPC.

What should I use between the top polystyrene layer and the wood/vinyl? Chipboard is cheap, but from what I've read might not last that long. Ply would be better, but is more expensive. OSB seems to fall somewhere between the two. It should go without saying that I'd use tongue and groove boards.

Finally, how long should I leave the concrete to cure before continuing with the floor? The guys building the conservatory think I should wait a few weeks, while everyone else (including this forum) suggests waiting somewhere around one month per inch of concrete so about four months in my case.

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