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I use a flap of plastic damp corse from Bunnings. It is black, flexible enough to slide over the track rails, and wide enough to close the gap and act as weather stripping on the gable end. I also use it under the side planks to help seal the track side against wind blown rain. It comes in different widths on rolls and is cost effective. The only time I had to do more to seal the front was in the massive storm we had last April with days of heavy rain and high winds (115kmph) - in that case I used duct tape prior to the storm to seal the edge of the flap on the front gable - no leaks.
Give sme thought to track locks and roof hold downs - these are very important. Good luck with the build.
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