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the moisture content of treated wood will vary greatly. If it been freshly treated it will normally be heavy. To be honest sticking a moisture meter in it is a wasted exercise. Its going to be used outside and will change its content greatly over the seasons. In the middle of the summer it could be very low in moisture content and then by the middle of winter exceptionally high. Thats why you see the gap between deckboards vary so much over the seasons. I find you have to allow a lot greater tolerances for the movement of the wood. As another example i never use the softwood handrail and spindles, which slot into the top and dbottom handrails, for decking as from my experiance looking at other installations, the spindles ending up working out of the handrails and coming away very quickly.
Over 20% is high from my memory; that was what my supplier used to aim for as a maximum.