De-icing strategy is not one material for every storm. Salt melts ice when pavement temperatures cooperate. Sand adds traction when melt is unlikely or when agencies limit salt for environmental reasons. Torwel spreaders and poly sanders handle both, but application goals differ.
Common questions from fleet supervisors
At what pavement temperature does rock salt stop working? Straight sodium chloride slows sharply below about 15°F (-9°C). Pre-wetted salt or blends with calcium or magnesium chloride extend performance on colder decks and hills.
When should we switch to sand? Use sand for traction on packed snow, gravel roads, and steep lanes where refreeze cycles make bare pavement unrealistic. Plan cleanup sweeps in spring where sand accumulates in drains.
Can one spreader run both materials? Many hoppers do, but abrasive sand wears augers faster than salt. Flush and inspect after sand shifts. Dedicated units often last longer when sand is a daily diet.
How do we reduce bounce loss? Lower spinner speed, use crushed material within spec size, and adjust gate height so particles land on pavement instead of bouncing to the shoulder.
Operators should record pavement temp, material type, and spread rate per route. Those logs build a local playbook faster than copying another town's policy. Review torque and corrosion notes in the polyethylene spreader manual if you store wet sand overnight.
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