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Are you sure 6 x 3 is strong enough for a 20ft bay ?
I would be looking at 9 x 3
So, 91” deep purlins at 15ft....... yep. Yep, that should do it.I was ways advised, 1/2 the span is the depth of the joists / purlin up to 15', then add an inch..
Stood me in good stead to date.
So, 91” deep purlins at 15ft....... yep. Yep, that should do it.
Sorry, just a silly moment. I am prone to them.Comedian in the house..
Half the span of 15' would obviously be 7.5, you then add an inch to get to the nearest available depth - so an 8 or 9" joist as a base line.
But you knew that already.