Green Wall (Facade)
Key Benefits
- Amenity & Aesthetics: Softens building appearance, seasonal interest (flowers, colour).
- Building Performance: Building Temperature Regulation: Shading, some evaporative cooling, insulation (C753 Ch 5).
- Environmental: Air Quality Improvement: Minor particulate capture (C753 Ch 5).
- Biodiversity: Provides habitat for invertebrates, nesting/roosting sites for birds/bats (Ivy).
- Metrics: Energy Saving (Cooling): 15%; Indoor Temperature Reduction: 2.7°C; Air Temperature Reduction: 1-3°C; Exterior Wall Temperature Reduction: 3°C; Noise Reduction: 2.6 db; Property Value Uplift: 2.5% (Assumed similar to Living Wall).
Technical Guidance
Wall Assessment
Check structural integrity and surface condition (esp. mortar joints for self-clingers). Ensure wall is weather-tight. Self-clinging climbers (e.g., Ivy, Virginia Creeper, Climbing Hydrangea) require sound surfaces they can grip; manage growth to avoid damage to windows/roofs/render.
Support Structure (If Required - GI Guide)
For twining/scrambling climbers (e.g., Honeysuckle, Jasmine, Clematis, Wisteria, Roses), a support structure (trellis, wires, mesh) is essential. Fix securely with appropriate wall fixings, using stand-off brackets (50-100mm+) to create an air gap for plant/wall health & maintenance (C753 Ch 29 principles). Ensure structure suits plant type and can support mature weight + wind load.
Planting Location (GI Guide - Planting)
Plant climbers at base in prepared ground (improve soil with compost, ensure good drainage) or large, deep containers suitable for mature size. Position away from drains/foundations where possible.
Plant Selection (GI Guide - Planting)
Choose climbers appropriate for aspect (sun/shade), wall height, support type (self-clinging vs. needing support), desired effect (evergreen/deciduous, flowers, autumn colour), growth rate/vigour, and UK climate. Consider UK natives (Ivy, Honeysuckle) for biodiversity. Be mindful of vigour (e.g., Wisteria, Russian Vine need strong support/regular pruning). Check for potential allergenicity or toxicity if publicly accessible.
Training & Pruning (GI Guide - Maintenance)
Guide young shoots onto supports. Regular pruning (annually or biannually, species dependent) needed to control size/shape, encourage flowering, remove deadwood, prevent obstruction (windows, gutters, vents).
Watering & Feeding
Water regularly during establishment (first 1-2 years) and dry spells, esp. container plants. Feed annually in spring (general-purpose fertiliser) or as needed.
Maintenance (GI Guide - Maintenance)
Lower than living walls. Primarily annual pruning, training, checking/maintaining supports, occasional pest/disease management. Self-clingers require monitoring to prevent wall/mortar damage.