Roman blind tape is also called Roman shade tape. It is a heavy twill tape with small plastic rings spaced evenly along its length. Roman blinds fold up into large pleats when raised. Because they are flat when lowered, they do not require much fabric and so are inexpensive to make. Use a heavy fabric such as twill or denim. Large prints create an interesting effect when the shades are raised.
Measure the length and width of the window inside the frame. Add 1 inch to the width of the window and 2 inches to the length.
Cut both the fabric and the lining to the measurements you calculated.
Pin the fabric to the lining with the right sides touching. Starting at the top of the blind, sew along both sides and the bottom edge. Use a 1/2-inch seam allowance. Clip the bottom corners, cutting the seam allowances off at a 45-degree angle.
Turn the blind right-side out and press it.
Sew Roman blind tape to the back of the blind along both sides. The bottom ring should be just above the lower edge of the shade, high enough so it does not show when hanging down.
Add additional rows of Roman blind tape between the first two rows so the rows of tape are no more than 18 inches apart. Be sure the bottom rings on every row of tape are all at the same height.
Saw the board to fit inside the top of the window frame.
Staple the blind to the top of the board with the top edge of the blind even with the back edge of the board. The shade should hang down over the front of the board.
Screw a screw eye behind each row of Roman blind tape.
Tie a piece of cord to each of the lower rings on the blind and run the cord up through every ring on the tape and then through the screw eye behind.
Run all the cords to one side of the shade through the screw eyes. Tie all the cords together outside the last screw eye so the shade cords can all be pulled at the same time to raise and lower the shade. Cut off any excess cord.
Blind cords are a strangulation hazard. Keep the cords out of reach of children and pets.