In August 2012, the installation of Bridge Preservation’s timber bridge deck waterproofing system was completed for the Oregon DOT’s Salmonberry Bridge in Tillamook County, Oregon.
The project began by milling off the existing asphalt to expose the underlying wood deck. After milling, a geotextile fabric was adhered to the deck. Immediately following the placement of the geotextile fabric, primer was applied to the entire deck surface. Approximately 30 minutes after the primer application, a base coat of Bridge Preservation’s Bridge Deck Membrane timber bridge deck waterproofing was applied at 80 mils. Upon completion of the base coat application, an additional 40 mils of membrane was sprayed to provide a medium to set broadcast aggregate. The purpose of this aggregated top coat is to provide additional shear bond strength between the asphalt and the timber bridge deck waterproofing membrane.
The asphalt wear course was applied the next day and the bridge was put back in service.
Salmonberry Bridge Rehabilitation
Tillamook County, OR
Legacy Contracting, Inc.