An engineered wood joist, more commonly known as an I-joist, is a product designed to eliminate problems that occur with conventional wood joists. Invented in 1969, the I-joist is an engineered wood product that has great strength in relation to its size and weight.
The advantage of I-joists is they are less likely to bow, crown, twist, cup, check or split as would a dimensional piece of lumber. I-joists' dimensional soundness and little or no shrinkage help eliminate squeaky floors. The disadvantage is very rapid structural failure when directly exposed to fire, reducing the time available for residents to escape and increasing the danger to firefighters.
When it comes to the foundation of a home, a joist is a strong, horizontal framing member that supports a floor. An I-joist is a structural member created using flanges, panel webs, and adhesives, ultimately forming what looks like the letter "I". I-joists can be used in the construction of roofs and floors.
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