Hello,

I'm in the process of building a conservatory from Willab Garden. The conservatory is in their winter class, meaning it is better/best insulated. However, Willab Garden states that regardless of class, a conservatory should be considered a room where moisture can enter. Therefore, they advise against using parquet flooring or regular chipboard flooring, as it risks getting moisture damage/rising.

Willab Garden recommends building the conservatory on a concrete slab and then laying tiles inside. This, of course, would be 100% moisture resistant. However, we are building our conservatory on an existing deck, about 1m above the ground. From the floor joists down 30 cm, I am insulating with polystyrene, leaving about 70 cm of air gap under the insulation towards the ground.

However, above the floor joists, what type of flooring board should I/one use that is suitable for a conservatory/is moisture resistant? I've visited various hardware stores and asked, but haven't received any good answers.

Tips are gratefully received!

/Martin
 
Composite decking?
 
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