Yes, you can install engineered hardwood without glue—but only if the product uses a click-lock system. These planks are designed to snap together securely, allowing for a floating installation over underlayment without any adhesive. In contrast, tongue-and-groove engineered hardwood usually requires glue in the joints for proper stability. For click-lock installations, it's helpful to use small pieces of painter’s tape across seams as you go to keep everything tight and aligned until the floor is fully locked in.