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Hollow core:Hollow core: Hollow-core doors are made from two thin veneer plywood or hardboard faces. Between the two are supports, often made of cardboard, to help keep the door rigid. These doors are light, inexpensive, prone to puncture, and ineffective as sound barriers.Solid core:Solid core: Some manufacturers carry solid core doors made from high-density fiberboard or hardboard. A top-quality engineered-core door may be constructed with hardwood sticking. === Frame Up Doorway for New Construction ====== Frame Up Doorway for New Wall Construction ===To transfer the load of a bearing wall to each side of a door or window, a header is placed over the opening and supported on each side by a stud nailed to a cripple or jack studThe opening bounded by the header and the two cripples and the sub-floor is called the rough opening of the door.Allow 2 inches for width and 2 inches or slightly more for the height of the inside door jam.* Refer to "[[Interior_Wall_Construction#Frame_a_Doorway|Frame a Doorway]]" on the "Interior Wall Construction" wiki page. == Fire Rated Door ==A fire door is a type of door, or barrier used as a passive fire protection item within buildings to prevent the spread of fire or smoke which may consist of dangerous chemicals. It is usually the only means of allowing people to pass through a fire-resistance rated wall assembly.=== Fire Door Brands ===* Mastercraft* Stanley Steel