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In the case of gable end truss, whole top need to be dropped to accommodate gable end roof panels over it.
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First select truss/s. Right click and from the contextual menu select 'Properties’.
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Truss parameter dialog box will appear. Tick ON Top drop by 89mm and click on OK
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Click on 'Yes' to update shape and support.
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Now whole top of the gable end truss have been dropped to accommodate gable end roof panels over it.
