Rain, snow and even cracked glass can't stop the U.S. Postal Service.
The glass, however, may shift a few things around for a while.
Work began last week to replace the glass paneling along the roof of the Cumming Post Office on Tribble Gap Road.
"It doesn't just entail changing the glass," said Postmaster Anne Berger. "After they change out the glass, they'll have to do sheet rock and painting."
The process, she said, is likely to take between three and four weeks.
All told, about 60 pieces of glass will be replaced atop the building, which is about 17 years old. The roof had been leaking for some time.
"They have to replace the entire thing," Berger said. "You can't just replace one panel because it weakens the structure."
Over the next several weeks, the post office will remain open, though some adjustments will be made.
"We have it sectioned off because of safety reasons," Berger said. "To pick up your post office box mail, you have to go up to the counter.
"We have people available to help assist with that."
Online editor Jim Dean contributed to this report.