According to the present invention, the frame is newly manufactured in advance with the door to be newly installed and shipped to the construction site, and the finishing frame is mounted on the door frame in which only the existing door of the remodeling site is removed and then finished. By minimizing the process in the construction, precise construction is done, the door remodeling is not only fast and safe, but also provides a quick installation remodeling system door and its construction method that can be eco-friendly remodeling without generating unnecessary industrial waste. The purpose is. Quickly installable remodeling system door according to the present invention for achieving this object is made of a "b" shaped cross-sectional shape to surround both sides of the rebate of the existing door frame, so that the upper surface to support the door An additional frame which is a length member formed integrally with the rebate portion formed in the shape of the "T"cross-section; A strip mounted to one side of a rebate portion on which the door is seated; A depth adjustment hole is formed to be fitted to the opposite side of the rebate portion in which the strip is installed, and a condensation prevention PVC member having a mounting recess formed in a portion projecting outwardly in contact with the door frame; A spacer inserted into the mounting recess to fix the door frame to facilitate attachment of the finishing material; And an inner molding finishing the surfaces of the PVC member and the spacer.
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