RC122 JanFeb 2026 - Magazine - Page 36
Proposed solutions
Given the extent of water in昀椀ltration and structural
The design approach to prioritize both functionality and aesthetic preservation, focusing on
deterioration, the TTC required a remedial solution that
enhancing skylight water management while minimizing disruption to transit operations.
would minimize ongoing maintenance demands. Budget
constraints limited the TTC’s ability to implement highly
invasive repairs or conduct frequent upkeep. Therefore,
any solution needed to address immediate safety concerns,
protect the structural integrity of the skylight, and extend
the service life of the assembly in the most cost-e昀昀ective
way possible, without major intervention similar to the
1990s program.
The ideal solution would provide a durable barrier against
water in昀椀ltration, slow down the rate of structural deterioration, and address the water leakage, managing the potential
public safety hazards caused by slippery conditions on the
platform. Additionally, upgrades to the access system, and
safe access onto the precast shelter roof, and along the length
of skylight, were necessary to ensure that future maintenance
could be conducted more safely and e昀케ciently.
The design approach, created by the WSP Canada team,
was to prioritize both functionality and aesthetic preservation, focusing on enhancing skylight water management while miniAnother major hurdle was the inaccessibility of certain sections of
mizing disruption to transit operations.
the skylight. The existing interior and exterior access systems were
Central to the waterproo昀椀ng strategy was the installation of continnon-functional. Access to the top of the barrel vault was limited by the
uous silicone strips at the majority of exterior joints. The silicone strips
position of the precast shelter. In addition, accessing the skylight from
were applied to both the existing expansion joints and other problem
above the platform was challenging due to spatial limitations and the
areas where water leakage had been most persistent. At expansion
safety risks of using exterior sca昀昀olding on an active subway line.
36—RENEW CANADA – JANUARY/FEBRUARY 2026
RENEWCANADA.NET
WSP
CONSTRUCTION
