To calculate the amount of lining required to make a blind again we need to establish the Cut Width and Cut Drop of the lining which are slightly different to the fabric:
LINING CUT WIDTH
The lining is narrower than the fabric and the Cut Width is equal to the Finished Width of the blind.
- Cut Width (lining) = Finished Width of blind
LINING CUT DROP
The lining is longer than the fabric though due to the rod pockets. To calculate the cut drop of the lining add a 5cm heading allowance, a 9cm hem allowance and an allowance* for each rod pocket to the finished blind length.
(*The rod pocket allowance is the circumference of the rod plus 1cm, our fibre glass rods require a 2.5cm allowance.)
- Lining Cut Drop = Finished Blind Length + 5cm heading allwnce + 9cm hem allwnce + (2.5cm*) per rod pocket
if using ROD POCKET TAPE
If you are using Rod Pocket Tape you will need to disregard the rod pocket allowance as you will not be making the rod pockets out of the lining. The LINING CUT DROP calculation will now be
- Lining Cut Drop = Finished Blind Length + 5cm heading allwnce + 9cm hem allwnce
LINING QUANTITY REQUIRED
The calculation for the amount of lining required to make a blind is the same as the calculation for plain fabric. Note we add an extra 5cm to the lining Cut Drop figure to allow for trimming it square.
- Multiply the "Number of fabric widths" by (Cut Drop Lining + 5cm trimming allowance) .