treatment for carpenter bees

Condo management sent exterminator who applied some type of dust underath brown wood trim on lower level. She did not treat upper level due to a screen being in the way (which is no longer properly installed).
Exterminator recommended filling the gaps on lower level with plastic cleaning pads (kind that resembles steel wool but made of plastic. She said a screen would also work.
For upper level exterminator recommended removal of the screen and treatment and then filling the gaps or putting up a screen.
Condo management is talking about addressing the gaps, but seem to have ignored the fact that upper level wasn't yet treated with any dust. Would addressing the gaps on upper level (either by stuffing or installing screen) be effective even if the area that wasn't yet treated with dust? Or would it cause trapped bees to try and bore their way out (or bore their into building..yikes!)
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