The present invention is formed by removing a portion of each arch leveling panels that make up the roof structure of the arch roof and that is the direction along which one is selected in the longitudinal direction or width direction of the arched panel forming step so that the predetermined distance apart groove, and one end of a fixing step of fixing the support in the respective groove, each coupled to a respective groove and coupling the other end of the fixed support extend in a direction which is selected in the length direction or width direction of the arch panel, which is installed guide bar phase, the finish was placed on the top surface of the guide bar finishing the inner surface of the arch roof including the step of providing a method comprising modifications of an existing arch roof ceiling interior. ; According to the present invention, while not removing the existing aging finish material which is bonded to the interior ceiling of the arch roof as well as thermal insulation and sound absorption features that will allow you to construction and aesthetic features exceptional finishes, has the advantage that the method is simple, low cost and with no existing roof arch interior space in a short period of time can be converted into a new multi-functional finish.
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