Project Profile: 160 Cherryhill London, ON – ESAM Group
Site: 160 Cherryhill
City: London, Ontario
Owner: Esam Group
Consultant: IWS Ltd.
Area: 17,000 sqft
Year completed: 2002
Scope of Work:
Remove existing assembly(s) and parapets to expose concrete deck. Supply and install Protected Membrane Roof Assembly, new parapets, drains, plumbing stack flashings, and metal cap flashing.
Safety rails were installed around the entire perimeter of the main roof area. The engineered roof anchors were utilized during this process to provide adequate fall arrest protection during this process. Materials and equipment were then loaded on the roof by crane. New parapets were built on the ground and hoisted up to the roof for installation.
The existing roof assembly was removed in sections using specialized equipment. Recyclable materials were taken to appropriate facilities to minimize the environmental impact.
The existing parapets were in poor condition. They were removed and replaced with new wood parapets constructed using 2X6’s and ¾” plywood. The new parapets were then anchored in to the concrete deck.
Custom-order plumbing stack flashings and new drains were supplied and installed as part of the contract.
IWS’ RS Base Hot Rubberized Asphalt System is applied direct to the primed concrete deck. The membrane is applied by squeegee in multiple passes as a hot liquid so it is 100% free of voids between itself and the deck. It is applied in two monolithic layers with white reinforcing fabric embedded between. This provides a monolithic, self-healing, fully reinforced system which eliminates the possibility of lateral water migration beneath the system. RS Base is extremely durable and flexible. It is a “living” membrane in that it will move with the structure and continue to perform flawlessly even if minor stress cracks develop in the concrete deck. These features make changes in plane and difficult details easy to effectively waterproof with all RS Base systems.
As the RS Base system was applied to the concrete deck, RS Separation Course was embedded into the membrane. This allows workers to walk on the hot rubberized asphalt without sticking to it.
Once the membrane system was completed installation of the insulation began. Dow Roofmate (Type IV Extruded R-5 per inch), with ship-lapped edges was installed. Care was taken to ensure the edges fit snug to adjacent boards and gaps between the insulation and details (plumbing stacks, parapets, drains, etc.), were minimized.
Filter fabric and gravel ballast were then installed over the insulation.
Safety rails were then removed as the new metal flashing was installed. Again, workers utilized the fall arrest anchors during this final stage of the re-roofing process.