The first phase of the closely watched $2.75 million windows project at South School—removing part of the original 1955 glass block, long porous and out-of-code, with caulk that has PCBs—has been completed on time and budget, district officials say. The work wrapped up Aug. 8, leaving the gym, “café-torium” and some inner courtyard spaces such as the library for the second phase (to be completed next summer), according to Nancy Harris, interim secretary of the South School Building Committee and interim director of finance and operations for New Canaan Public Schools. “At this point in time, I have to tell you that from a personal perspective, as you look at where the glass block was, it’s covered in plywood, covered by Tyvek, covered by a rubber membrane and boards so that it’s weather-tight, it actually looks neater and less jarring than the original glass block, and now you can see the comparison between the gymnasium and the Tyvek covered space so it was really a success,” Harris said at Monday’s Board of Education meeting, held in the Wagner Room at New Canaan High School. The glass block system and original windows at the school need to be replaced, and building expansion joints and caulking and trim in the windows repaired, Shelton-based engineering and environmental consulting firm Tighe & Bond and SLAM Construction Services of Glastonbury have found.