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Pavements constructed with clay, concrete or natural stone paving units - Design and installation of modular permeable pavements. Guide

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1 Scope

This part of BS 7533 gives guidance on the design of permeable pavements surfaced with:

  • concrete paving blocks manufactured in accordance with BS EN 1338;

  • concrete paving flags manufactured in accordance with BS EN 1339;

  • natural stone slabs manufactured in accordance with BS EN 1341;

  • natural stone setts manufactured in accordance with BS EN 1342;

  • clay pavers manufactured in accordance with BS EN 1344; and

  • other modular paving units, including porcelain.

It applies to areas subject to pedestrian and vehicular loading, with axle loads up to 11 000 kg and a cumulative design traffic of up to 30 million standard axles (msa).

This part of BS 7533 specifically excludes design traffic above the specified maximum and areas of higher vehicle loading such as aircraft pavements and those in ports and specialized industrial areas. Although permeable pavements are often used effectively in conjunction with tree pits and tree root protection systems, the design and construction of tree root protection and tree pits is a specialist application and is not covered in this part of BS 7533.

Design for impermeable surfaces with water stored within the pavement foundation layers, commonly known as a reservoir foundation below, is not covered by this part of BS 7533.

This part of BS 7533 applies to the design and installation of permeable pavements formed from paving units bedded on and jointed with graded granular permeable aggregates or permeable mortar where there is a full depth permeable base and/or sub-base construction below. Following this guidance provides a sustainable drainage system (SuDS) pavement design.

A surface constructed with a permeable laying course and permeable jointing material, bound or unbound, where the underlying pavement construction is impermeable (for example, an existing or new impermeable road base or similar) can be used to provide a surface drainage function or degree of surface water control in some scenarios and is covered in Annex A. This configuration, sometimes referred to as “permeable paving overlay”, can be considered a SuDS component where it is demonstrated by testing that it can cleanse and/or attenuate surface water for the lifetime of the pavement.