#courtyard landscaping
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The new group standard establishes the proportion of permeable paving in courtyards as a verifiable metric. But how should one select the particle size for crushed-stone paving to ensure compliance? This article provides specific particle size ranges—6–10 mm for surface walkways, 20–40 mm for decorative cover, up to 26.5 mm for base layers, and 2–8 mm for joint infill—while also outlining key control requirements for silt content, layer thickness, slope, and the inclusion of a filter layer.
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