What should be observed on a ladder to assess if it has been subjected to extreme temperatures?

When assessing a ladder for exposure to extreme temperatures, blistered paint or heavy carbon deposits is a key indicator. Extreme heat can cause paint to bubble or blister as it breaks down, leading to visible surface changes. This phenomenon occurs because high temperatures compromise the integrity of the materials and coatings applied to the ladder, resulting in physical alterations.

Furthermore, heavy carbon deposits can indicate exposure to intense heat, particularly in scenarios involving fire or significant thermal events. These deposits can accumulate on the surfaces of the ladder, signifying that it has been exposed to conditions that could compromise its structural integrity and safe operation.

In contrast, discoloration of wood might occur due to various factors, not just high temperatures, and loose joints can result from wear or improper maintenance rather than thermal exposure. Excessive noise during operation could suggest mechanical issues or lack of lubrication but is not a direct indicator of temperature exposure. Therefore, blistered paint or heavy carbon deposits are the most reliable signs to observe when determining if a ladder has been subjected to extreme temperatures.