Highway Noise Buffer: Fence, Berm, and Planting Strategies for Rhode Island

Multi-Layered Sound and Visual Screening for a New England Property

A wooded buffer between a Rhode Island backyard and a highway provides summer privacy but fails in winter when deciduous trees drop leaves. A 6-ft stockade fence is planned; plantings must enhance it in shade.

Sound Attenuation Reality Check

Plants alone reduce noise ~7 dB per 100 ft of dense hedge—minimal for highway noise (90 dB). Effective reduction requires mass: solid fences, earth berms, or walls, combined with vegetation.

Recommended Approach

1. Solid Barrier: 6-ft solid fence (stockade, board-on-board, or masonry) on the property line.
2. Berm (If Space Allows): 3–4 ft high earth mound against fence, planted with dense evergreens.
3. Planting Layers:
   • Fence line: Shade-tolerant evergreens—Taxus (yew), Ilex opaca (American holly), Tsuga canadensis (hemlock, if adelgid-free).
   • Berm/Forward: Thuja occidentalis 'Emerald Green', Picea abies (Norway spruce), Pinus strobus (Eastern white pine).
   • Understory: Rhododendron maximum, Kalmia latifolia, Leucothoe, ferns, Pachysandra.

Rhode Island Resources

• URI Cooperative Extension: uri.edu/ce
• Landscape Screening Guide: uri.edu/ce/ceec/ppprivacyscreening
• USDA Zone Map: zone lookup

Noise Masking

Add a water feature (waterfall, fountain) near seating areas. Bird-friendly plantings (serviceberry, viburnum, coneflower) create pleasant biological sound.