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Open web joists, (also known as open metal web joists) are another common way to structurally frame an upper floor in a residential building. They are also commonly used in flat roofs for both domestic and commercial buildings. Open-web joists can incorporate modern ventilation and heat recycling systems, which help to achieve higher CSH levels. Using this type of joist also eliminates costly cutting and drilling when installing services such as electrics due to the open web design.