When Rhode Island builder John Spier is getting ready to frame a floor, he doesn’t place an order for dimensional lumber. He calls in an order for I-joists. These engineered floors joists are pricier than regular lumber, but because they are straighter and flatter, they can be installed more quickly. That means big savings in labor costs. I-joists are a component of an engineered floor system, and they require a specific installation process and hardware, including joist hangers. After the joists are in place, a subfloor locks together the layout.
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