QUESTION

I'm looking for design guidance on the correct MMCD detail (minimum concrete thickness, strength, etc.) and/or other recommended documentation where a roll over curb provides vehicular access to a either a residential lot and/or a parking lot that will also receive delivery and service vehicles. There is an MMCD Dwg #3 that shows 120mm concrete sidewalk thickness, I'm looking to confirm if 120 is sufficient for both passenger and service vehicle loading. Your MMCD drawings for a barrier curb with driveway let-down show 150mm conc thickness seemingly thicker than 120 for sidewalk as it is carrying vehicle loads. I'm trying to find out if 120 is acceptable for vehicle and service vehicle loading.

COMMENT

General guidance on sidewalk construction and maintenance is available on Federation of Canadian Municipalities website under INFRAGUIDE. There is no standard MMCD cross section for commercial grade rollover curb, but we will check around for supplementary specs in use in the Lower Mainland. The (MMCD) roll over curb is not designed for commercial vehicles. Some designers have tried thickening the base of the (MMCD) curb to 300mm from 200mm to allow greater “flexing” of the curb. Others recommend a couple 10mm rebars 100mm from the bottom. However, there is no specific (MMCD) guideline. Similarly for driveway sidewalk, 200mm thick concrete would be preferred or use a wire mesh.