About the product

An I-Joist is an engineered wood joist, designed to eliminate the problems that occur when using traditional timber joists. The joists are shaped like an “I” and are lightweight, but strong. An I-joist has two main parts, the web and flange. The web is sandwiched between a top and bottom flange, creating the “I” shape.

Metal Web Joists have a very similar design rate but offer easier installation of services. However, Metal Web Joists are considerably more expensive than I-Joists.

Metal web or Posi joist systems are a combination of timber chords and pressed metal webs which together form an ‘open-web’ joist. Their open web design allows for the installation of services such as pipework, cabling, mechanical heat recovery systems and other services to be passed through the metal webs without the need for notching or drilling and typically span greater distances than I-joists.