Summary: Located on the northern edge of the University of Guelph’s campus, Lennox Addington Hall is a large student residence complex constructed in 1970. Typical of this era of large building projects, Lennox Addington Hall had limited thermal insulation, consumed an excessive amount of energy, and suffered structural damage due to interior water vapour and exterior water penetration. This re-skinning project, designed by Larkin Architect, uses soya-based polyurethane foam insulation, extruded terracotta ceramic tile and an open jointed rainscreen system. The project has set a precedent for the re-skinning of residential towers in Southern Ontario. Total energy savings exceeded 50 percent when compared to the existing building, and will remove 260 tonnes of carbon from the atmosphere annually.