Technical guide to French drains, geotextile sub-base separation, and soakaway calculations for Greater Glasgow soils.
Fix heavy clay soil drainage in Glasgow by excavating 250mm–300mm deep, laying non-woven geotextile fleece, and installing perforated French drain pipes surrounded by 20mm clean gravel connected to soakaway crates.
Glasgow clay soil retains up to 70% more surface water than sandy loam, creating hydrostatic pressure under paving slabs during severe freeze-thaw cycles.
Glacial till in areas like Bearsden (G61) and Newton Mearns (G77) acts as a water barrier. Without subsurface land drains, heavy winter rain collects beneath shallow patio bases, forcing aggregate upwards during freeze events.
A robust clay drainage system comprises: 1) Geotextile isolation fleece, 2) 150mm MOT Type 1 sub-base with perforated land drains, and 3) Flush ACO slot channels shedding water to soakaways.
By establishing continuous laser-leveled falls (1:60 ratio), surface runoff flows cleanly into perimeter slot channels before penetrating sub-layers.
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