About This Project

In November of 2001 the installation of Bridge Preservation’s spray applied railroad waterproofing system was completed for the Canadian Pacific Railroad project Mavis Road Underpass Grade Separation. The spray applied railroad waterproofing installation was completed on-site in Mississauga, Ontario, Canada.

The project began with surface preparation of the deck. Decks #1 and #2 were prepared using shot blasting for the horizontal surfaces and sand blasting for the vertical surfaces, including the abutments. Deck #3 was prepared using water blasting, due to consistent rain during the preparation of that deck. Surface preparation is a critical step because it provides the mechanism by which the Bridge Deck Membrane spray applied railroad waterproofing will adhere, ensuring a long service life.

After readings of the environmental conditions were taken and found to be adequate for the waterproofing application, the decks were primed using Bridge Deck Concrete Primer. Priming is another critical step, helping to ensure a strong bond between the concrete deck and the waterproofing system. The abutments were sprayed first, which allowed the General Contractor to begin backfilling.

Immediately following the priming of the decks, the application of Bridge Deck Membrane spray applied railroad waterproofing began. The abutments were sprayed first, followed by the remainder of the decks. The ballast was loaded directly on the spray applied railroad waterproofing membrane approximately an hour after installation, allowing the bridge to be back in service within hours of the completed waterproofing application.