Unkeyed plaster refers to which of the following?

Unkeyed plaster refers to plaster that has become detached from the underlying structure, resulting in it being loose. This condition can occur due to various factors such as age, structural movement, or improper installation. When plaster is unkeyed, it may not adhere securely to the lath or substrate, which can lead to potential risks such as cracking and falling pieces, particularly if lead-based materials are involved. Understanding the state of plaster in a building is crucial during risk assessments, especially in older properties where lead may be present.

In the context of the other options, securely attached plaster indicates a stable condition, whereas smooth finish refers to the texture rather than the attachment state. Painted over plaster is related to its aesthetic treatment rather than its structural integrity. Recognizing the difference is essential for effective lead risk assessment and ensuring the safety and health of occupants in residences.