Ridges and tool marks are acceptable for a Level 1 finish. This level is often specified in the plenum area above ceilings, in attics, or in service corridors. In garages, warehouse storage areas and other similar areas where the final surface appearance is not of concern, a Level 2 finish is the recommendation. Level 2 may be specified where moisture resistant gypsum board is used as a tile substrate. This change is to further differentiate Level 2 from Level 1.
Joint compound is applied over all fastener heads and beads.
The surface is left free of excess joint compound. Ridges and tool marks are acceptable for a Level 2 finish. This sentence also appears in the ASTM C840 Appendix. In the past there has been some confusion as to whether tape pressed into joint compound and covered with joint compound in a single operation fulfilled the requirements of Level 1 or Level 2. This statement is intended to clarify the requirements of Level 2.