Asbestos-Containing Materials and Building Systems
The exam expects you to predict where asbestos hides in a building and to apply friability and RACM definitions correctly before anyone touches the material.
Friability and RACM
Friable means crumbable, pulverizable, or reducible to powder by hand pressure. Category I nonfriable covers packings, gaskets, resilient floor covering, and asphalt roofing products. Category II is every other nonfriable material, such as cement transite board. RACM includes all friable ACM plus Category I material that will be sanded, ground, cut, or abraded, and Category II material likely to be crumbled. Nonfriable material becomes RACM by the act of sawing it.
Where it sits in building systems
Surfacing material: spray-applied fireproofing on beams and decking, acoustical texture on ceilings. Thermal system insulation: magnesia block and calcium silicate on pipes and boilers, corrugated paper air-cell wrap on elbows and valves, boiler lagging, mudded fittings. Miscellaneous: 9x9 and 12x12 floor tile and its mastic, sheet flooring backing, joint compound, duct seam tape, fire doors, electrical panel backing, glazing putty, caulk, roof flashing cement. Mechanical rooms, pipe chases, plenums, crawlspaces, and ceiling voids are the high-probability zones.
Worked example
A 1974 school has hard, white preformed pipe covering that looks like fiberglass. The visible core is fiberglass, but the corrugated paper jacket and the mastic at the fittings are suspect. Because it is thermal system insulation in a pre-1981 building, it is presumed ACM until sampled. Cutting an elbow to remove a valve makes that section RACM, so containment and notification logic follow the friable rules, not the fiberglass appearance.
Traps
Equating fiberglass with no asbestos and skipping the jacket, mastic, and lagging. Treating nonfriable cement board as harmless when it will be sawed dry. Forgetting that floor mastic is a separate homogeneous area from the tile. Assuming the 1 percent threshold means trace asbestos is unregulated for OSHA purposes.