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Ballest, preventing expansion and contraction of rails.
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With that temperature range, you will need to leave gaps in the rails at the least. Wood doesn't react to heat as much as to humidity but I suspect you also have high humidity when it is warm. On roofing plywood, they stencil instructions to leave 1/8" gaps betweem each 4' x 8' piece to allow for expansion. Is there any possibility of putting in a window AC unit to reduce the heat and humidity in the summer?
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