You can rely on your contractor to cut engineered floor joists on the jobsite, but structural integrity can be weakened if the holes are cut improperly. Atlanta-based Georgia-Pacific Wood Products says the XJ 85 prefabricated joist has strategically placed openings that allow contractors to install plumbing, HVAC, and electrical systems with a clean finish. What's more, GP claims the product's consistent quality will result in fewer callbacks, faster installation, and lower overall costs. Georgia-Pacific Wood Products, 800.284.5347;