What is the 3-5-7 Rule? - 3West Environmental - Asbestos, Lead Paint and Mold Testing (2024)

Current regulations require a certain number of samples per distinct or “hom*ogeneous” material type.

The general rule of thumb is the 3, 5, 7 rule:

  • Less then 1,000 SF of the suspect material (3 samples)
  • Between 1,000 SF and 5,000 SF of the suspect material (5 samples)
  • Greater than 5,000 SF of the suspect material (7 samples)

So if there is <1,000 SF of Popcorn Ceiling then only 3 samples would be needed, and so on.

What is the 3-5-7 Rule? - 3West Environmental - Asbestos, Lead Paint and Mold Testing (2024)
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