I saw at a construction site “Wood Frame = Wage Theft”. What does this mean and why?

Question

I saw at a construction site “Wood Frame = Wage Theft”. What does this mean and why?

In: 42

Answer 1

I assume that the sign is claiming that construction workers who build wood frame houses are underpaid, or not paid what they were promised. Wage theft often takes the form of unpaid overtime.

But I’m not sure why that type of construction would be any more prone to wage theft than any other kind of construction method.