Enclosure or Encapsulation

The second engineering control includes two processes called "enclosure" and "encapsulation."

You already learned that lead exists in its pure form but can also bind to other elements or substances to create a new substance. This ability to bind actually provides us with another way to reduce the lead inhalation or ingestion: by attaching it to another material. This process, called "encapsulation," coats lead with a material (like acrylic or epoxy coating or flexible wall coverings). This material bonds to the surface and encapsulates the lead.

"Enclosure" is another way to reduce lead exposure. As the name suggests, the process "encloses" or covers the lead with another substance, which stops the lead from forming harmful dust that employees can ingest or inhale. An example of enclosure is covering floors that are coated with lead-based paint with a vinyl tile or linoleum.

Regarding enclosure, OSHA notes that "the building owner or other responsible person should oversee the custodial and maintenance staffs and contractors during all activities involving enclosed or encapsulated lead-based paint. This will minimize the potential for an inadvertent lead release during maintenance, renovation, or demolition."

To learn more about Construction Lead Safety visit our Construction Lead Safety Online Training Certification web page.