I have the Alan Staines book, the Timber Assoc book on Carports/Pergolas and also the Timber Solutions computer program and I find that I get different answers for timber sizes from each of them. I am designing a pergola with a pitched roof (not sure yet whether it will be gable or hip ended) that will be 8.0m long and 5.5m wide attached to the house on the 8.0m side via Roof-Extendas (I think!). It will be covered by polycarbonate. I have a couple of questions- - when using the span...

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