Got a quote today from a bloke who can supply me with 180mm wide Jarrah decking. He reckoned it would be good for the job, but would need to be screwed down to avoid cupping.

The deck is semi-covered by a roof, but faces west, so will get some weather on it.

How likely is it to cup?

Am I best off sticking with the more traditional 90 x 19mm decking?

Cheers

Jayson.