Plan the height of your double barre. A good rule of thumb is to place the barre at waist height, but if you're constructing your barre for the general population, size it according to standard measurements. Forty-two inches is a standard height for the top barre and the lower barre is usually 10 inches lower. If you're teaching children, you'll want both barres to be lower: 20 and 28 inches for children ages 4 to 12.
Clean the pipes well with a damp cloth to remove any film.
Wrap Teflon tape around all the threads on the pieces that you will be screwing together.
Screw T-joints into both ends of one of the 6-foot pipes.
Screw the two long vertical pipes into the bottom holes of the T-joints on either end of the 6-foot pipe.
Screw the two short vertical pipes into the top holes of the T-joint on either end of the 6-foot pipe.
Screw elbows into the tops of the two short vertical pipes.
Screw the second 6-foot pipe into the elbows in between the two short vertical pipes.
Create feet for your barre by screwing T-joints at the bottom of the two long vertical pipes. Screw 1-foot pipes into both sides of both T-joints. Screw elbows into the ends of the four 1-foot pipes. Plug the elbows with the caps.