Barn Door Window Shutters Diy . The sliding mechanism for most barn doors will also give your windows a refreshing look. Bolts 4mm diameter (must easily fit through pulley wheel centre) x 4 £2. Top Mount Modern Tube Track 330 Modern window treatments, Barn door from www.pinterest.com Add a unique & custom focal point to your home! Attach the backing to the frame using wood glue and ¾” finish nails. For the barn door “z” pattern, we cut two boards measuring 4 inches by 18 inches and one board measuring 4 inches by 32 inches.