![]() When installing mechanically attached roofs, the membrane roll is laid down and then the screws are driven directly through the insulation boards into the metal deck below. On top of most buildings is a metal deck, then a layer of insulation, then the roof. Builders like them because they can be easily inspected by the manufacturer, who can quickly validate the workmanship by verifying the fastener pattern and their proper installation. They can be installed faster and at a lower cost. Mechanically attached roofs are by far the most common, dominating around 80% of the market. Why do you care? Because failing to match your roof’s construction with your actual needs can mean you’re paying for value you don’t actually need. Virtually all roofs-fastened through either method-sit on top of a layer of insulation that rests between the roof and a metal deck, which is fixed to the structure below. Roofs are typically fastened to commercial buildings in one of two ways: mechanically attached or fully adhered (there are others but these are the most popular). ![]()
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