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Line 35: Because permeable pavements may be required to support heavy loads (driveways, laneways, etc.), the sub-base and base course may require compaction to prevent heaving and shifting.===Sub-base reservoir===In permeable pavement systems, the sub-base is the layer of granular material that is laid on the sub-grade. The granular sub-base should be clear, crushed 50 mm stone. See the Permeable pavements: Specifications page for detailed sub-base material specifications. The construction steps, key inspection points, and mistakes to avoid for sub-base reservoir are the same as / similar to the guidance given in the storage reservoir section. However, depending on the municipality and the design, compaction of the sub-base reservoir may be required. For example, the [https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf City of Toronto’s Construction Specification for Permeable Interlocking Concrete Pavers]<ref>City of Toronto. 2021. TS 861 Construction Specifications for Permeable Interlocking Concrete Pavers. https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf</ref> details the following steps for sub-base installation.'''Construction Steps:'''#Place sub-base aggregate in 200 mm lifts (maximum)#Compact each lift with a 9-ton vibratory roller, with two passes in vibratory mode and two passes in static mode, or until there is no visible movement of the aggregate.#Use a plate compactor for smaller areas that the vibratory roller cannot reach.===Base course===In permeable pavement systems, the base course lies on top of the sub-base reservoir. See the Permeable pavements: Specifications page for base material specifications. The construction steps, key inspection points, and mistakes to avoid for the base course are the same as the guidance given in the storage reservoir section. However, depending on the municipality and the design, compaction of the base course may be required. For example, the [https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf City of Toronto’s Construction Specification for Permeable Interlocking Concrete Pavers]<ref>City of Toronto. 2021. TS 861 Construction Specifications for Permeable Interlocking Concrete Pavers. https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf</ref> details the following steps for base course installation.'''Construction Steps:'''#Place base course aggregate in 100 mm lifts (maximum)#Compact each lift with a 9 ton vibratory roller, with two passes in vibratory mode and two passes in static mode, or until there is no visible movement of the aggregate.#Use a plate compactor for smaller areas that the vibratory roller cannot reach.
→Permeable pavement sub-base and base course
==Permeable pavement sub-base and base course==
==Permeable pavement sub-base and base course==
{{:Permeable pavement sub-base and base course}}
{{:Permeable pavement sub-base and base course}}
==Trench, Chamber, and Perforated Pipe Installation==
==Trench, Chamber, and Perforated Pipe Installation==