A thought just struck me. Do installations take into account expansion of the rails? A 24 foot aluminum rail will expand about four tenths inch from winter to summer here in Maine. That's a lot of movement on the feet, & the bolts, especially if you don't have flashing. Even with flashing, should this be taken into account? I was planning on having a solid 44 foot rail, (two 22' bolted together), but now I'm thinking at least one expansion joint, but maybe two? No panels shall span a joint. Here's a sketch. The top one is 22 foot rails, the bottom one is 11 foot rails. Red blocks are expansion joints, free to move. I will make an inner slide & secure it to one leg, let it slide in the other. I'd leave enough slack in the wires. Any thoughts?
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