Q: Must the plastic be "sealed" to the floor on all edges or just "secured or held" to the floor?

It depends on the specifics of the renovation job.  The RRP Rule requires the renovation firm to cover the floor surface, including installed carpet, with taped-down plastic sheeting or other...

It depends on the specifics of the renovation job.  The RRP Rule requires the renovation firm to cover the floor surface, including installed carpet, with taped-down plastic sheeting or other impermeable material in the work area 6 feet beyond the perimeter of surfaces undergoing renovation or a sufficient distance to contain the dust, whichever is greater Floor containment measures may stop at the edge of the vertical barrier when using a vertical containment system consisting of impermeable barriers that extend from the floor to the ceiling and are tightly sealed at joints with the floor, ceiling and walls.  It is up to the certified renovator to determine how to cover the floor in such a way that dust and debris are captured by the containment and the site can be cleaned at the end of the job.