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concerning angled rafters for pergola

orvals's picture

 I am wanting to build a pergola over my existing patio I would like to catch the early morning sun in the east and as the day matures have the western afternoon sun blocked causing the patio to be shaded.  I am currently considering a 22-degree angle open to the East which hopefully means that by 2-3 P.M. my patio would be completely in the shade.


How would I keep those angled timbers from bowing over time?


thanks for your responses