stone dust (screenings)
In French: poussière de pierre
Definition
Finely crushed stone with a high share of fines, still often used in Quebec as bedding. It holds water and can pump up through joints; several public specifications refuse it under pavers and call for concrete sand.
Also called
- screenings
- crusher dust
Other names in French
- criblure de pierre
- poussière de roche
Sources
Toronto prohibits limestone screenings and stone dust as bedding. (s. 3.80.05.04)
TS 3.80, Construction Specification for Concrete Unit Pavers · City of Toronto
Montreal calls for a manufactured sand with few fines for the bedding. (s. 6, tableau 4)
DTNI-3C, Mise en oeuvre des pavés et des dalles en béton ou en pierre naturelle sur lit de pose granulaire · Ville de Montréal