Step 10. Use one of the following three recommended methods for joining the PANELS at the corners:
Method #1: Cut the panel with a masonry saw, and screw it using recommended interlocking procedure laid out in sets 4 through 7 above.
Method #2:
A. Interlock the last panel and screw it up, allowing the panel to protrude past the corner.
B. Using a razor knife, cut the backing board flush with the second wall.
C. Bend the panel back toward the second wall. The backer board will break along the cut. (Trim excess or uneven parts flush.)
Method #3:
A. Score the back of the panel with a razor knife at a point flush with the second wall.
B. Using a claw hammer or similar tool, pry brick from the backer board along the cut.
C. Screw the panel completely to the wall, breaking the portion protruding beyond the corner.