Engineered wood types

• I-joist
• Glued laminated timber
• Multilaminar veneer
• Veneer-based
            o Plywood
            o Laminated veneer lumber (LVL)
            o Parallel strand lumber (PSL)
            o Stamina wood
            o Parallam
• Parallel strand lumber

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I-joist

An engineered wood joist, more commonly known as an I-joist is a product designed to eliminate many of the problems that occur with using conventional wood joists. Invented in 1969, the I-joist is a man made engineered wood product which has incredible strength in relation to its size and weight. The biggest notable difference, other than their look, compared to dimensional lumber is that the I-joist is designed to carry heavy loads over long distances while using less lumber than a dimensional solid wood joist of a size necessary to do the same task. As of 2005, approximately 50% of all wood light framed floors were framed using I-joists.

An I-joist comprises two main parts, the web and flange. The web is sandwiched between a top and bottom flange, creating the “I” shape. The flange can be made from laminated veneer lumber or solid wood finger-jointed together for ultimate strength. It is then grooved on one side to receive the web.

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