. Download free Adobe Acrobat Reader DC software for your Windows, Mac OS and Android devices to view, print, and comment on PDF documents. A truss is an engineered product designed to carry roof or floor loads out to bearings. A truss is manufactured from custom-cut components, which are connected together using metal truss plates. Residential roof trusses are usually installed at 2' On Center (OC), post frame trusses up to 10' OC and Floor Trusses are used at 12", 16", 19.2" or. Our Project Star Wiki covers Project Star map, locations, items, controls, and more. Read on for the Project Star Wiki guide and understand every basic concept. In Project Star, arrows are of many types, the higher the rarity, the higher the chances of obtaining a rare stand.