Can you put sound deadener over factory sound deadener? | ASLONG Guide

Can You Put Sound Deadener Over Factory Sound Deadener?

Professionals in the sound insulation materials industry commonly encounter the question: can you put sound deadener over factory sound deadener? This article explores best practices, compatibility concerns, and installation tips, helping reduce project guesswork and ensuring optimal acoustic performance.

Is Layering Aftermarket Sound Deadener Over Factory Sound Deadener Advisable?

- Feasibility:

- Yes, applying aftermarket sound deadener over existing factory sound deadener is a standard industry approach.

- This method is used to enhance sound insulation where factory materials are insufficient for demanding acoustic environments.

- Multiple layers can target both resonance and airborne noise for better results .

- Benefits:

- Adds mass and damping, further reducing vibrations and noise transmission.

- Enables targeted improvement in problem areas (e.g., car doors, industrial panels).

- Customizes acoustic properties for specific commercial or automotive applications.

- Compatibility Considerations:

- Ensure the aftermarket product is compatible with the substrate (e.g., butyl, foam, or asphalt-based).

- Factory sound deadener must be clean, dry, and securely bonded to the surface.

- Avoid layering materials with vastly different expansion/contraction rates to prevent delamination.

Common Industry Approaches

Selecting Appropriate Aftermarket Sound Deadener

- Material Types:

- Butyl rubber, mass loaded vinyl (MLV), foam composites—match to application for best results.

- Adhesion:

- Pressure-sensitive adhesive (PSA) recommended for strong bond.

- Check compatibility charts provided by leading manufacturers.

Surface Preparation

- Clean thoroughly:

- Remove dust, oil, and residues from factory sound deadener.

- Inspect adhesion:

- Ensure factory layer is not loose or deteriorating.

Installation Tips

- Layering Strategy:

- Apply new deadener in overlapping seams to avoid gaps.

- Follow manufacturer’s recommended thickness—over-layering can reduce overall effectiveness due to reduced flexibility.

- Testing:

- Measure and compare noise reduction before and after installation for quantifiable improvement .

Data and Industry Standards

- Performance:

- Studies show up to 40% additional noise reduction when combining materials versus factory deadener alone.

- Industry Guidelines:

- Reference ASTM E90 and ISO 16283 standards for field measurement of airborne sound insulation.

Frequently Asked Questions (FAQs)

- Will added layers increase weight?

Yes, each layer adds mass—factor this into load-sensitive applications.

- Does warranty apply after aftermarket installation?

Check OE and aftermarket manufacturer policies before proceeding.

Key Takeaways

- Sound deadener can be effectively applied over factory material if properly prepared.

- The right materials, preparation, and installation are key to achieving optimal acoustical performance.

- Comply with professional standards and manufacturer recommendations for best results.