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When the bottom track is on the tub's threshold, position the storage column over the extension piece and slide it into place in the chosen wall jamb. Secure the storage column to the jamb with self-drilling screws.
Place the center jamb on the other side of the storage column and fasten it to the column with the included screws. Don't forget: the center jamb also has a middle slot where a bumper insert will need to be installed. The shelving tower is locked into place as well as the side tracks and the bottom track.
To cut and install the top track, first measure the distance from wall to wall. This measurement must be precise since it is the length to cut the jamb. Next mark the top track at the cutting positions. For a more precise cut, use a miter. Cut the track and, if necessary, file the edges. Keep in mind that you may want to widen them, then position the top track over the wall jambs and push down.
Finish installing the shelving units according to personal preference. Slide the bumpers over the middle screw on the jamb opposite the shower column and the center jamb; cover all exposed screw heads on the center and side jambs with the screw covers.
Caulking the frame before hanging the doors is recommended since caulk smears on glass can sometimes be difficult to remove. There are three main points on the frame to caulk: first, on the outside edge of the bottom track, then on both inside corners. Finally, repeat the procedure on the inside corner of the side tracks. Begin caulking the frame by applying a bead of silicone caulk just under the outer edge of the bottom track on the outside of the tub. Next, put a bead where the center and side jambs meet the bottom track; use a finger to smooth out any rough edges. Next, put a bead where the center and side jambs meet the bottom track; use a finger to smooth out any rough edges. Finally, place a bead where the side jambs and walls come together inside the shower.
Hanging the doors is a two-step process. Standing on the outside of the tub, lift the inside panel with the rollers (Image 1) facing the shower and hang on the inner rail of the top track (Image 2). Do the same for the outside panel, where the rollers now face away from the shower and the door will hang on the outer rail of the top track. Push the shower doors to the side, step inside the tub and align the slots on the panel guide with the holes on the bottom track. Insert two pan head screws into the slots and tighten with a screwdriver.
The final step is to move the doors back and forth to see whether the panel guide is working properly.