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2. Paver base - Wikipedia

   en.wikipedia.org/wiki/Paver_base

   Paver base is a form of aggregate used in the construction of patios and walkways whose topmost layer consists of mortarless (or "dry-laid") pavers. The first layer in the construction of such a surface is called the subgrade —this is the layer of native material underneath the intended surface.

3. Subbase (pavement) - Wikipedia

   en.wikipedia.org/wiki/Subbase_(pavement)

   Layers in the construction of a mortarless pavement: A.) Subgrade B.) Subbase C.) Base course D.) Paver base E.) Pavers F.) Fine-grained sand. In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement ...

4. Base course - Wikipedia

   en.wikipedia.org/wiki/Base_course

   F. Fine-grained sand. The base course or basecourse in pavements is a layer of material in an asphalt roadway, race track, riding arena, or sporting field. It is located under the surface layer consisting of the wearing course and sometimes an extra binder course. If there is a sub-base course, the base course is constructed directly above this ...

5. Pavers (flooring) - Wikipedia

   en.wikipedia.org/wiki/Pavers_(flooring)

   The base layer should be 6" deep for walkways, or 12" deep for driveways. [10] The base material should either be 3/4" crushed stone (to allow water to drain through it) for a 1/4" crushed stone bedding, or 3/4" minus crushed stone (to prevent sand from sinking through it) for a concrete sand bedding. The base should be compacted every 6".

6. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Impervious concrete pavers installed with ample void space between each paver function in the same way as pervious concrete pavers as they enable stormwater to drain into the voids between each paver, either filled with coarse aggregate or vegetation, to a stone and/or soil base layer for on-site infiltration and filtering. [4]

7. Road surface - Wikipedia

   en.wikipedia.org/wiki/Road_surface

   [citation needed] There is some structural strength if the road surface combines a sub base and base and is topped with a double-graded seal aggregate with emulsion. [19] [49] Besides the 4,929 kilometres (3,063 mi) of granular pavements maintained in Saskatchewan, around 40% of New Zealand roads are unbound granular pavement structures. [43] [50]