Establishing rigorous sound and vibration criteria before bid day is essential for any new traction elevator project. Omitting these requirements often leaves building owners with noisy, uncomfortable systems that spark complaints and costly retrofits. At Kaiser Elevator, we know that getting your elevator’s acoustics right at the specification stage not only elevates ride quality—it protects your asset, reduces risk, and ensures long-term tenant satisfaction. In this guide, we’ll walk you through everything you need to include in your spec, why it matters, what the key standards dictate, and how to avoid common pitfalls as you prepare your elevator package for bid day.
Definitions: Sound and Vibration in Traction Elevators
- Sound: Airborne noise produced by the elevator’s mechanical systems, doors, and operation—expressed in dB(A), which reflects human hearing sensitivity.
- Vibration: Mechanical oscillations transmitted through the elevator car, structure, and rails—measured in milligravity (mg) units, representing perceived ride smoothness.
- Isolation: Methods of reducing sound and vibration transmission to the building’s structure and adjacent spaces, such as pads, brackets, and acoustic treatments.
Why You Must Specify Sound and Vibration Criteria Before Bid Day
For elevator designers and specifiers, noise and vibration are not just comfort issues— they define the quality perception, usability, and compliance of your building. In residential, healthcare, education, and premium commercial projects, elevator noise exceeding 50–55 dB(A) inside the cab or 30–45 dB(A) in adjacent rooms will generate dissatisfaction and, ultimately, financial risk. Once installed, retrofitting isolation or acoustical treatments is far more costly and disruptive. That’s why at Kaiser Elevator, we advocate for including unambiguous, testable thresholds directly in your elevator specification from the outset.
International Standards and Key Metrics
What Standards Should Govern Your Specifications?
- ISO 18738 – Sets measurement techniques and ride quality levels for acceleration, vibration, and noise inside elevator cars.
- DIN 8989 / DIN 4109 – European standards influencing noise protection in buildings, defining maximum permissible sound levels for rooms adjacent to elevators.
Both standards require measurements using A-weighted decibel scales (dB(A)), targeting sound levels perceived by the human ear. The difference between a passing and failing project can be just a few dB(A), so clarity in your specification is essential.
Recommended Sound and Vibration Thresholds by Location
1. Inside the Elevator Car
- Max Noise: 52–55 dB(A) averaged (LAeq), peaks up to 57 dB(A) permitted during operation
This provides a ride that feels quieter than typical conversation and prevents disruption for passengers even at higher speeds. We recommend stating: “Measured noise inside the car at 1 meter height shall not exceed 55 dB(A) LAeq under normal operational conditions, with peaks not exceeding 57 dB(A).”
2. At the Landing Door
- Max Noise: 50 dB(A) averaged, with peaks up to 60 dB(A)
Since door events are the noisiest moments, insist on premium damping hardware and state: “Noise at the landing door, measured 1 meter away, shall not exceed 50 dB(A) LAeq, with peaks up to 60 dB(A).”
3. Machine Room and Top Floor Adjacent Spaces
- Max Noise: 45 dB(A) maximum in adjacent rooms, measured 1 meter from the control cabinet or machine wall
Ensure all motors, brakes, and controllers are isolated on elastomeric or spring pads, minimum static deflection 0.10 inch, to decouple mechanical noise from the building structure.
4. Residential and Protected Spaces
- Max Noise: 30 dB(A) (LAeq), including impulse noise, for dwellings, patient rooms, or other sensitive locations
This is stricter than for commercial offices and often requires resilient brackets, double walls, and detailed coordination.
5. Vibration
- Peak-to-Peak: ISO A95 ≤ 12 mg for vertical and horizontal car acceleration
- Acceleration: ≤ 1.0 mg up to 4 m/s; ≤ 1.2 mg at higher speeds
- Jerk: 0.7–1.4 m/s³ for all operational phases
Step-By-Step Framework for Specifying Sound and Vibration Criteria
Step 1: Define Occupancies and Critical Adjacencies
- Map elevator hoistways and machine rooms relative to residential, academic, healthcare, or quiet-use spaces.
- Select correct thresholds based on occupant sensitivity. Residential and healthcare require stricter isolation and lower dB(A) than offices or retail.
Step 2: Draft Unambiguous Specification Language
- Require quantifiable criteria: “Noise measured inside car shall not exceed 55 dB(A) LAeq…”
- Include third-party testing and reference relevant standards—ISO 18738, DIN 8989— in your writing.
Step 3: Mandate Isolation and Construction Best Practices
- Specify elastomeric or spring isolators under all major components, with 0.10 inch minimum static deflection.
- Require guide-rail damping brackets at every floor and intermediate level.
- Call for decoupling of hoistway anchors or resilient channels in wall assemblies where needed.
Step 4: Specify Drive and Motor Performance
- Digital, closed-loop, solid-state motor drives with VVVF control are essential for minimizing acceleration noise and jerk.
- Request regenerative drives and soft-start capability to further control noise and energy usage.
Step 5: Testing, Commissioning, and Acceptance
- Insist on third-party A-weighted sound and vibration testing at empty, mid, and full load.
- Define all test locations: inside the car, at landing doors, in machine room-adjacent spaces, and in hoistway perimeters.
- Acceptance criteria must be met before final payment, with remedial work at contractor’s cost if thresholds are not reached.
Specification Template (Adaptable to Your Project)
ELEVATOR SOUND AND VIBRATION PERFORMANCE A. Noise Performance Criteria 1. Measured car noise ≤ 55 dB(A) LAeq, peaks ≤ 57 dB(A). 2. Landing door noise ≤ 50 dB(A) LAeq, peaks ≤ 60 dB(A). 3. Machine room adjacent noise ≤ 45 dB(A) LAeq. 4. Protected spaces noise ≤ 30 dB(A) LAeq including impulses. B. Vibration Criteria 1. Peak-to-peak (A95) ≤ 12 mg vertical/horizontal. 2. Acceleration ≤ 1.0 mg (≤4 m/s), ≤1.2 mg (>4 m/s). 3. Jerk: 0.7–1.4 m/s³. C. Isolation & Construction 1. All machines, brakes, motors, and gears on isolation pads, deflection ≥ 0.10 inch. 2. Damped guide-rail brackets at all levels. 3. Decoupled hoistway anchors as needed. D. Testing & Acceptance 1. Third-party testing required as per ISO 18738/DIN 8989. 2. All measurements A-weighted. Non-compliance triggers remedial work and re-testing.
Best Practices for Controlling Elevator Sound and Vibration
- Engage your elevator consultant early. Their expertise is vital in modeling and verifying that your proposed criteria are achievable and cost-effective.
- Balance elevator speed with adjacent sensitivities. A slower, quieter elevator may better serve residential or hospital uses.
- Budget for third-party commissioning. The upfront cost protects you from costly after-the-fact changes.
- Never accept vague promises like “quiet operation” alone. Demand quantifiable, testable criteria anchored in international standards.
- For detailed scope assignment in early phase planning, see our checklist at elevator scope gap checklist.
Pitfalls to Avoid in Elevator Sound and Vibration Specifications
Vague Language
Statements like “Quiet operation to be provided” leave too much to interpretation. Always specify the metric, location, method, and standard.
Ignoring Machine Room or Door Events
Many occupant complaints stem from door closing noise and machine room vibration. Specify high-quality, electronically damped hardware and require baseline testing for buffers and doors before handoff.
Confusing Sound and Vibration Isolation
Sound pads do not eliminate vibration, and vibration isolation does not fully block airborne noise. Address both paths in your criteria and construction details.
How Kaiser Elevator Delivers Exemplary Sound and Vibration Performance
We recognize each building and owner’s priorities are unique. At Kaiser Elevator, our process ensures total clarity and compliance:
- Early-stage consultation to confirm achievable sound and vibration performance for your structure.
- Collaborative specification review—helping specifiers and architects draft bid-ready language and measurable acceptance criteria.
- Independent, third-party commissioning to verify all targets are met at handover.
- Post-installation training for property and facility managers on maintaining ride quality over the elevator’s 20–30+ year lifecycle.
Our purpose-built approach means you receive a truly quiet, smooth, and code-compliant elevator installation—no guesswork or surprises.
Frequently Asked Questions
What happens if my elevator does not meet the sound and vibration criteria after installation?
You should require in your specification that non-compliance triggers remedial work (such as additional isolation or component replacement) at no cost to the owner, followed by re-testing. At Kaiser Elevator, we help clients structure acceptance provisions clearly to protect your interests.
Do I need stricter limits for hospitals or residential towers?
Yes. Healthcare and residential environments require 30–45 dB(A) maximum in adjacent spaces and tighter vibration thresholds. Kaiser Elevator works closely with design teams to ensure specifications reflect these unique needs.
How do I test for elevator sound and vibration compliance?
Ask for third-party A-weighted measurements at set locations (inside car, landing door, machine room, adjacent rooms) using defined loading and speed conditions. Reference ISO 18738 and include testing costs in your project budget.
What elevator design choices help minimize sound and vibration issues?
Key strategies include premium door hardware, spring or elastomeric isolation under all equipment, resilient bracketry for rails, digital VVVF drives, and decoupled wall/anchor assemblies. We advise specifiers on system choices that fit budget and performance mandates. For tight shaft conditions in hotels, see our detailed guide on reducing hoistway space without compromising ride quality.
How can I make sure multiple elevators won’t create a compounding noise issue?
Simulate worst-case operating conditions (e.g., both cars at full speed simultaneously) in your acoustic and vibration commissioning. Kaiser Elevator’s engineers can help model cumulative effects in pre-bid review.
Is all this overkill for a commercial office?
Often, you can relax standards slightly for office or retail buildings, but clarity is still paramount. Over-specifying adds cost; under-specifying means risk. Kaiser Elevator helps clients balance real-world needs with manageability.
Conclusion & Next Steps
Sound and vibration may not be the first line item in your package spec, but they’re mission-critical for long-term performance and user satisfaction. By including clear, testable criteria—aligned with ISO and DIN standards—you protect your investment and your project’s reputation. For building owners, developers, architects, and consultants preparing for bid day, Kaiser Elevator stands as your specialist partner. Our engineering and delivery teams turn acoustic and vibration challenges into predictable, silent results that last for decades.
If you’re preparing specs for an upcoming project, or if you want to discuss lessons learned from previous installs, reach out to us for expert guidance. Your riders may never notice how quiet and comfortable your elevator is—but that’s exactly the outcome you want.
