Sound and Vibration Barriers for a Busy Road

A corner-lot homeowner in New Jersey sits below a busy two-lane road. Heavy trucks cause noticeable vibration through the house. They ask if a dense evergreen hedge or 6–8-foot privacy fence would stop the vibration.

Vibration vs. Airborne Noise

Ground-borne vibration from heavy trucks travels through soil differently than airborne sound. Fences and plants primarily block airborne noise; they have limited effect on vibration transmitted through the ground.

Effective Sound Barriers (Airborne Noise)

• Mass-loaded walls: Concrete, masonry, or foam-filled concrete panels. Height and continuity are critical—no gaps at grade.
• Wood options: Heavy timber (not standard fence boards), or plywood sandwich panels with foam core.
• Vegetative buffers: Dense, multi-row evergreen plantings 18–50+ feet wide, extending well beyond the protected zone. Reduces noise 1–10 dB depending on width.

Vibration Mitigation

• Earth berms combined with dense groundcovers and shrubs absorb some ground energy.
• Loam and sandy soils dampen vibration better than clay or rock.
• Concrete and masonry transmit vibration efficiently—avoid rigid walls tied to the house.

A variance for taller-than-code barriers is likely needed. Combining a massive wall (for airborne noise) with a wide planted berm (for ground vibration) yields the best result.

— Mark Harshman, MAH Drafting