Insurance firms adopt aerial tech to check up on properties.

Travelers Insurance issued the notice in early November. It was clear what Athena Haddon had to do.

The original slate roof on Haddon’s Worcester three-decker had to be replaced — or else she would lose her homeowners insurance coverage when the policy expired on Dec. 26.

The non-renewal notice left her stunned. A roof replacement cost $30,000, she said.

“My agent said to me that the insurance companies recognize a slate roof to be good from 50 years to 200 years, and so mine was about, what, 130 years old?” she told Boston.com recently. Haddon said she had had no issues and no leaks.