According to HUD guidelines, how many XRF readings are required for interior and exterior walls?

According to HUD guidelines, how many XRF readings are required for interior and exterior walls?

• A. One reading per wall.
• B. Four readings, one on each wall.
• C. Two readings total.
• D. Eight readings total.

Answer: (B)

The main idea is to sample each distinct wall to get a representative picture of lead paint presence. HUD guidelines call for one XRF reading on each wall to capture potential variation in lead content from wall to wall. In a typical room with four walls, that means four readings total, one on each wall. This approach helps ensure you don’t miss a wall that may have higher lead levels, which could occur if you only sampled fewer walls or only one wall. The goal is to balance practical testing with a representative assessment of the wall surfaces.

The main idea is to sample each distinct wall to get a representative picture of lead paint presence. HUD guidelines call for one XRF reading on each wall to capture potential variation in lead content from wall to wall. In a typical room with four walls, that means four readings total, one on each wall. This approach helps ensure you don’t miss a wall that may have higher lead levels, which could occur if you only sampled fewer walls or only one wall. The goal is to balance practical testing with a representative assessment of the wall surfaces.