We retrofit both towers at Toronto City Hall. They were converted from a single glazed zipper gasket system to a custom, double glazed system. As it is a designated heritage building, we had to minimize changes to the appearance. Other towers in the GTA include the Madison Centre (structural...

I represent C3 Polymeric Limited, the contractor that is completing the retrofit. There have been a number of questions asked and points raised that I will address below. Are vision units installed from inside?: No. The new system, including vision glass, is installed from the exterior. Once...