1. Position 2 pieces of wood parallel to each other on either side of the collapse.
2. Place 2 pieces of wood perpendicularly across base pieces.
3-4. Add additional layers of wood, with each layer perpendicular to previous level.
Grid patterns are utilized to search large or small areas when hands-and-knees searches are conducted
Utilize a pattern approach (such as right to left walls), call out to survivors in each room, marl searched rooms