What does "unkeyed plaster" refer to?

"Unkeyed plaster" refers to plaster that is loose or bowed due to a broken bond. In this context, unkeyed plaster occurs when the bonding material between the plaster and the underlying surface fails, leading to a lack of adhesion. This condition can create a risk for lead exposure during abatement processes, as disturbed lead-containing plaster may release harmful particles into the air or cause contamination to surrounding areas. Recognizing unkeyed plaster is crucial for ensuring proper remediation techniques are applied, ultimately protecting both workers and residents from lead hazards.

The other options could confuse this term: completely removed plaster describes a different state and does not pertain to bonding; smooth and even plaster suggests a polished finish rather than a loose condition; and fresh plaster refers to newly applied material that hasn't yet set or cured, which is not related to the integrity or bonding issues of previously applied plaster.