Beginning on July 24, Silktown Roofing of Manchester has been working to replace the school’s old roof, which had leaked for more than a decade. “I think they did a fantastic job,” said Tom Millerd, the school district’s director of facilities. Residents approved the project at a referendum in April, authorizing the town to spend up to $1.79 million. In June, the town was notified that it would qualify to be reimbursed 67.14 percent of the project’s cost by the state. Eight bids were opened on July 9. Silktown Roofing submitted the low bid of $1.156 million. The town’s share of Silktown’s bill is about $380,000.