DALLAS – The company that built the Dallas Cowboys’ indoor practice facility that collapsed this spring is telling its customers that the ill-fated fabric structure got a new roof last year because of team concerns about “aesthetics,” not structural problems.

Nathan Stobbe of Summit Structures LLC included the explanation in a letter sent to customers of the Allentown, Pa.-based company. The letter, which was obtained by The Associated Press, seeks to reassure customers that their buildings are safe.

“Please be assured that your buildings have been designed, engineered ...

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