Frisco city hall and public library is undergoing a roof replacement that will cause the entrances to be periodically closed.

Work started Aug. 2 and is expected to last six to eight months, said Mack Borchardt, special assistant to the city manager. The timeline, however, could change due to weather and the need for other repairs.

Repairs will also be made to the building’s envelope, which is what separates the environments of building with and without air conditioning.

The roof replacement comes after water leaks were discovered, Borchardt said. The city is going to look into the source of the leaks during construction.

“We’re also looking at the integrity of the original water-proofing that was done during the initial construction of the building,” Borchardt said in an email to Community Impact Newspaper.

Borchardt said there was also hail damage on the roof.

“It is deemed by the insurance company as primarily cosmetic,” Borchardt said. “It is just wise at this point to replace the roof.”

The new roof will be better able to withstand hail, he said, but will have the same look.

The total estimated cost of the repairs is $2.1 million, Borchardt said. City council approved the expenditure at a July 2 regular meeting.

From Friday, Aug. 2 through Sunday, Aug. 4, the north entrance will close, Borchardt said. And at some point, the south entrance will also close. Additional closings will be posted on the city and library’s websites.

Protective “tunnels” will be put in place to shield those who enter the building.