Page 30 - SandyBankBayDesignGuidelines.pdf

2.0 SITE & LANDSCAPE
Figure . - Retaining wall utilizing regional stone
• Retaining walls are to have a minimum batter of 1:12 when connected to buildings. Batter of retaining walls may be increased to 2:12 for site walls not associated with the site’s architecture.
• Retaining walls are to be used in combination with plantings and utilize materials that complement the architecture such as indigenous, dry stacked, or understated mortar stone.
• Locally sourced lava rock or regional stone is preferred for all retaining walls. A dry stack pattern that draws upon the regional rock wall patterns is suggested. Walls are to incorporate a mix of sizes and shapes with larger stones predominating at lower levels. Horizontal coursing should predominate.
• Topsofretainingwallsthattransitionintothesitearetobeshaped to blend with natural contours. Ends of walls should not be abrupt, but are to be designed to create natural looking transitions with existing land forms and vegetation.
• All walls are to be designed with an integrated planting concept that uses layers of shrubs, vines and trees to soften and blend them into the site.
• In general, retaining walls may not delineate or parallel Improvement Envelopes or property lines for long distances. Walls should utilize multiple offsets and curvilinear alignments to respond to the site’s topography. Geometric offsets may be used when walls are tied to the building’s architecture and associated outdoor room and courtyard designs.
30 SANDY BANK BAY DESIGN GUIDELINES