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There is a limit of how much you can built in this game, though I've already experience to build a tall large structure which means that the poles, beams, roof support, stone support or any thing that can strengthen your house will be easily destroyed due to decaying and no stability for the house. Mixing both  stone/ wood will lessen the decaying. But since you're talking about the roof support, the game currently have two roof support which is a cross one and the side one. You can strengthen them by using poles and beams. Sorry for long comment