What type of ladder raise is usually used when the ladder can be raised perpendicular to the target surface?

The flat raise is the appropriate choice for raising a ladder when it can be positioned perpendicular to the target surface. This raising technique involves laying the ladder flat on the ground and using a two-person method to raise it directly against the wall or surface, allowing for secure and stable placement. This technique is often used in situations where there is ample space and a direct path to the wall, making it efficient for quickly placing the ladder in position for access.

The other options have specific applications that are not as suitable for a straightforward, perpendicular raise. A hand raise is generally used when space is limited or when a person needs to stabilize the ladder at the base. A periscope raise is typically used to maneuver a ladder around obstacles when a direct approach is not available. The drawbridge raise is used primarily for raising the ladder at an angle, which does not apply directly when the goal is to raise it perpendicular. Each of these methods has its place, but the flat raise specifically allows for optimal vertical positioning against the target surface.