Eco-joists LPI Joists from Louisiana-Pacific, branded &"Solid Start&", replace traditional sawn-timber joists with a lightweight &"I&" beam design. The product consists of two LVL (Laminated Veneer Lumber) flanges bonded to an Oriented Strand Board (OSB) web. In the manufacture of both LVL and OSB, it is possible to use small diameter timber, making LPI Joists efficient in the demand on …