More and more of the communication on residential job sites these days is taking place in Spanish. On balance, that's good news: It means that the industry's chronic labor shortage is finally giving way to a large and growing pool of new workers.

But for many builders, it's a trend that also raises some practical questions and concerns. When you don't speak Spanish yourself, for example, how do you give instructions to non-English-speaking employees or subs? How do you provide OSHA-mandated safety training to workers who may speak little or no English? What's the employer's...

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