New York State Department of Health‘s (NYSDOH) Environmental Laboratory Approval Program (ELAP) has released an update that revises FAQ #10 from the 4/8/11 FAQ document.  This update is posted at:

http://www.wadsworth.org/labcert/elapcert/forms/Vermiculite%20Guidance_Rev062212.pdf.  

The revision separates vermiculite into two types.  Vermiculite material used for thermal systems insulation (TSI), surfacing materials, and other miscellaneous ACM (including but not limited to:  existing or new surfacing material, plaster, pipe lagging, and sprayed-on fireproofing) or vermiculite material used for attic fill, block fill, and other loose bulk vermiculite material.  For the vermiculite material used for attic fill, etc. nothing has changed.  We still cannot analyze it and material must be assumed to contain asbestos and designated an asbestos containing material.

New Evaluation for Surfacing Material Containing Vermiculite

For the vermiculite used for TSI, surfacing material, etc. anaylze by ELAP certification manual item 198.1 (polarized light microscopy [PLM] friable method).  Vermiculite evaluation shall follow these three steps:

1. If vermiculite is calculated to be less than 10% of the entire material composition and no asbestos fibers are detected, the material may be reported as non-ACM.
2. If any asbestos fibers are identified, analysis must proceed according to Item 198.1 PLM and reported as ACM according to Section 6.3.
3. If vermiculite is calculated to be 10% or more of the material, the material must be reported as ACM.

According to NYSDOH ELAP the reason for the difference is that vermiculite used for TSI, etc can be more constrained that loose fill, there is less of a public health concern pertaining to airborne asbestos fibers following disturbance.