Long, straight rail runs set out across a standing-seam roof — where alignment and thermal movement decide the finish.
- Focus: rail straightness and thermal expansion
Why straight lines are engineering, not aesthetics
Aluminium rail expands and contracts with temperature; a 20 m run can move several millimetres between a cold night and a hot afternoon. Splice joints and clamp spacing are set to absorb that movement so nothing binds or buckles — and the visibly straight result is the byproduct of getting the thermal detailing right. See metal roof systems.
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