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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. * 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