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Determine the height needed for the metal wall. If trimming the sheets is necessary, an easy way to get all the pieces cut to the same height is to stack them up on top of each other and use a jigsaw to trim them.
Place J-channels on the top and bottom of where the corrugated metal will slide in. If there are any light switches or outlets in the area, hold the metal to the height it will sit and mark the area to cut out. Cut and remove the piece using a jigsaw.
Slide the metal walls into the J-channel. Make sure that both the top and the bottom are inserted before sliding them in.