Roof Joists Noggins or Purlins?

Hi,

I am in the process of completing our pergola. But I have had a massive set back. The roof joists twisted after all the hard work of painting and making all the required cuts. So, I have decided to changed. In order to avoid this happening again I know I have to use noggins but I don't like the look of them.

So, I was thinking of putting in a cross beam (I think they are called purlins) which would be notched into the main joists. Would this be enough to stop the joists from twisting?

Thank you.

 

Hi Again. Put noggins in but use a whole saw to put a pattern in them or crossed noggins from 3 by 2

 

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