Asbestos Sampling - # of Samples

Asbestos Sampling - # of Samples

How many samples are required to be taken and analyzed?

No sampling is required if the inspector suspects that the materials are ACM and treats them as ACM. However, for a suspect material to be classified as non-ACM, a minimum number of samples must be collected and analyzed. The following summarizes the minimum number of samples for collection and analysis. A homogeneous material is a material that appears to be uniform when properties such as age, color, and texture are compared.

Thermal System Insulation (TSI)

Thermal System Insulation includes materials such as boiler insulation, pipe insulation, duct work insulation, furnace gaskets and vermiculite.

  • At least three (3) samples from each homogeneous material of TSI.
  • At least one (1) sample from patched TSI that is less than six square feet.
  • For pipe fittings, in a manner sufficient to determine if the material is asbestos-containing.
Surfacing Material

Surfacing material includes materials such as spray-applied fireproofing, troweled-on plasters or ceiling textures.

  • At least three samples from homogeneous materials of 1000 square feet or less;
  • At least five samples from homogeneous materials of greater than 1000 square feet but less than 5000 square feet;
  • At least seven samples from homogeneous materials of greater than 5000 square feet.
Miscellaneous Material and Nonfriable Suspect ACM

Miscellaneous materials include all materials that are not TSI or Surfacing Materials, such as floor tile, ceiling tile and linoleum.

  • For each homogeneous material, a sufficient number of samples are required to be collected and analyzed to determine if the material is ACM.
  • Samples are not required to be collected from homogeneous materials that the certified inspector has determined to be nonasbestos-containing material, such as fiberglass or rubber.
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