Because the smoke has more places to live. Plaster is porous and takes soot into its surface; lath gaps and balloon framed cavities give smoke a vertical distribution system that drywall on modern studs does not; and matching a plaster system in repair is a craft line that drywall never carries. The scope therefore includes cavity mapping and, where the reservoirs demand it, opening and sealing work. A quote that prices an older Pontiac home as if it were a drywall ranch has not walked its walls, and the difference will arrive later as the July odor or the change order, priced worse in both forms.
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