Before acting on $812,172 in additional funding sought for Osborn Hill School renovations, the Board of Selectmen on Wednesday told the committee overseeing the project to provide more information in writing.

In 2012, the town approved $4.2 million to replace windows and doors and remediate PCBs found in the gymnasium at the Stillson Road elementary school. The work on the windows and doors appears to be complete, but Kim Marshall, the chairman of the Osborn Hill Building Committee, told the selectmen there have been cost overruns caused by issues such as additional environmental testing and the rental of modular rooms while the gym has been closed.

That accounts for $340,000 of the request for more money, while Marshall said $471,539 would be used to construct an enclosed walkway from the school's annex to the main building. It originally was included as an "alternate" when the project was put out to bid.

"We'd like to see something in writing," First Selectman Michael Tetreau responded. He said also would like information regarding why the walkway, which initially was proposed to cost about $70,000, now is projected at more than $400,000.

"We need a little more background," he said.

Originally, the project was proposed primarily to replace Osborn Hill's windows as a way to increase energy efficiency. However, testing of the window's caulk uncovered elevated levels of PCBs in parts of the school, particularly the gym. The gym has not been used since then.