What is a requirement when tying two ladders together?

When tying two ladders together, it is essential to secure them from both the top and bottom. This practice ensures that the ladders maintain stability and prevent any unwanted movement while in use. By securing the ladders from both ends, you create a more robust connection that can withstand the forces exerted during climbing and working at heights.

Securing only from the middle or just the base could lead to instability or even collapse under weight, exposing workers to significant fall hazards. Additionally, keeping the ladders apart would negate the purpose of tying them together, which is to create a safer means of access and working platform at elevated levels. Hence, securing from both the top and bottom is the best practice for ladder safety in construction.