Surface Regularity

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A measure of unevenness of the path base and surface surfaces.

Checking tolerances on surface regularity are normally expressed in terms of the permissible departure (maximum gap) from the underside of a 3m long timber straight edge laid along the surface of path base and surface.

For a path base, the maximum gap under a 3m long timber straight edge should be 10mm.

surface_regularity_base2

For a path surface, the maximum gap under a 3m long timber straight edge should be 5mm.

surface_regularity_surface2

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