The maximum weight that an extension ladder can hold is identified by its maximum load capacity. Performance rating is sometimes referred to as performance review.
Look for the following ladder ranks:
IAAs can handle up to 375 lbs.
IA Type ladders are capable of handling up to 300 pounds.
Ladders can handle up to 200 pounds.
II Type ladders are strong enough to support 225 pounds.
II Type ladders can handle loads up to 100 pounds.
The ladder load capacity needed for your project, take into account your weight, the weight you'll be carrying with you on the ladder, and any tools you'll be using on the ladder.