Slope ratio is the fundamental mathematical formula used by code inspectors to verify sidewalk compliance. For instance, an ADA-compliant ramp is limited to a slope ratio of 1:12, which means that for every 1 inch of vertical rise, there must be at least 12 inches of horizontal length. Using incorrect ratios during a sidewalk or driveway installation will fail a DOT inspection and require a complete, costly removal and re-pour of the concrete.
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