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There were a number of reasons Rainer. Firstly the by doing it this way I could mount the rollers directly under the trusses and not have to add a support member to each side of the roof. Secondly, to roll it across the top of the warm room would have meant finding someway to support the rail bearers. This would have meant either mounting posts against the end wall (which I wasn't keen on) or installing very tall poles at the end of the warm room. I could probably have worked something out, but it was just so much easier to do it this way.
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