Traditionally, polychlorinated byphenyls (PCBs) were found in fluorescent light ballasts, transformers and capacitors. In recent years, the Environmental Protection Agency (EPA) has found that caulk containing PCBs was used in many buildings in the 1950s through the 1970s. In general buildings built after 1978 do not contain PCBs in caulk.
As caulk ages, it cracks and flakes from the source, causing PCBs to migrate from the caulk into air, dust, surrounding materials and soil.
During renovation, PCB caulk can be encountered and pose a worker exposure issue and t rigger special removal and disposal requirements.
The EPA is "recommending" that owners of older buildings test brittle, aging masonry and window caulking.
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