Code 5480 applies to employers engaged in interior plastering work.  The operation involves mixing plaster with water by hand and applying the mixture to walls and/or partitions by means of a hand trowel.  A plastering contractor may also perform minor finishing work on previously installed drywall such as filling in small holes and taping.

This classification also applies to interior waterproofing operations performed using a hand trowel.  Most waterproofing work is done in residential structures, usually basements, or where water is most susceptible to leak.  Before the waterproofing is done, the leaks and cracks are chipped out to an appropriate size for filling so that plastic cement will adhere properly.  This chipping process is done by hand or using an electric chisel gun.  The surface is then cleaned and primed.  The plastic cement mixture is mixed to proper consistency and the cracks and leaks are filled using a hand trowel.