To make a box-style bed canopy, we recommend a minimum of 12-13 yards for a Twin Bed, 14-15 yards for a Queen, and 16-17 yards for a King sized bed. You will also need to use a Grounded Shielding Mat to complete the canopy. Email us at info@theshieldingshop.com for more details. Before grounding your canopy, verify if your outlet is grounded correctly with this plug tester.