Q. I thought it was illegal to use asbestos?
A. Asbestos mining ended in the U.S. in 2002, however the US still imports over a thousand tons of asbestos every year for use in roofing, coatings and various other materials.
Q. Where is asbestos commonly found on bridges?
A. The three most common locations are in the gaskets or grout in the expansion joints in parapet walls, in the grout under railing bolt plates, and in the tar-like material used to seal the tops of wooden posts in the wing walls.
Q. Can you tell if a material is asbestos containing just by looking at it?
A. No. The fibers are so small they cannot be detected without a microscope. This is why we have to sample the material to determine if it contains asbestos.
Q. Do I submit culverts for inspection as well?
A. No. The inspections are currently limited to those structures meeting the federal definition of bridges. (Those that currently have a B- or P- number in the Highway Structures Information System (HSIS). The exception is a culvert which has a suspect material on it (e.g. caulk, gasket, patching material).