Boot isolation: Tips and step-by-step plan

Causes of noise pollution on boats

The engines and generators of ships produce both airborne noise and contact noise. Airborne noise is created by vibrations that spread through the air, while contact noise occurs when vibrations are transmitted through the ship's hull. These vibrations propagate through the hull and create a noisy environment even at low RPMs. 

Main sources of noise:

• Engine compartment: The engine itself is the largest source of noise, with strong vibrations transmitted through the hull. 
• Hull: Without adequate insulation, vibrations contribute to contact noise, which can spread throughout the entire ship. 

Types of sound problems and their dangers

Sound issues range from annoying to potentially dangerous. The greatest risk is that excessive noise prevents crew members from understanding each other, which can lead to dangerous situations. Additionally, the combination of airborne and contact noise makes navigation unpleasant.

How do you solve sound problems on the boat?

Addressing noise issues on a boat requires a thoughtful approach that reduces both airborne and contact noise. Effective insulation of your boat makes a world of difference in this regard. Follow this step-by-step guide to insulate your boat and ensure a quieter, more comfortable sailing experience. 

1. Identification of sound leaks 

Locating sound leaks is the first step in optimising sound insulation. Place a flashlight in the dark engine compartment and close all hatches and doors. Any place where light comes through is a potential sound leak that needs to be addressed. By sealing these places before installing absorption material, you prevent sound from escaping and ensure better sound insulation. 

2. Surface preparation 

Before applying the absorbent material, you should ensure that the surface is clean, dry, and free from oil or dirt. This is especially important in insulation in engine compartments where oil stains are often present. A clean substrate ensures that the self-adhesive layer of the absorbent material adheres optimally. This is important for the effectiveness and durability of the engine compartment insulation. 

3. Choose the right materials 

Depending on the location and the nature of the sound, different materials are suitable: 

• Engine Compartment: Use absorbing foams such as EASYfoam PU or FireSeal HR for sound insulation in your engine compartment. They feature a moisture and oil-repellent top layer to reduce airborne noise. FireSeal HR, with its high specific weight, also provides additional sound insulation and strength. 
• Engine Cover: Reinforce the casing with EASYmass sound insulating panels to reduce noise disturbance. These panels are ideal for adding weight and insulation to lightweight materials such as wood and plastic. 
• Steering Box: Opt for EASYfoam PU or FireSeal HR with a moisture and oil-repellent top layer to minimise noise interference. FireSeal HR offers extra sound insulation due to its high specific weight. 

4. Placing of absorption material 

When placing absorption material, it is important to cover large, flat surfaces completely. This includes walls, ceilings, and the cover of the engine compartment. EASYfoam PU or FireSeal HR are excellent choices for reducing airborne sound in these areas.  

For weighting down lightweight materials such as wood or plastic in engine compartments, it is best to use EASYmass sound insulating panels. Make sure to apply the material tightly and without gaps, as even small openings can reduce the effectiveness of the insulation. 

5. Absorption of impact sound 

Contact noise, caused by vibrations that spread through the ship's hull, requires specific heavy absorption materials. These materials must be applied around the engine and at all contact points where vibrations may arise. By combining these materials with anti-drumming mats, you can minimize the transfer of vibrations to the rest of the ship. 

6. Accessibility and maintenance 

When installing absorbent materials, consider the accessibility of important components for maintenance. Ensure that essential components such as pipes, cables, and ventilation openings remain accessible.  

7. Check and fine-tuning 

After placing the absorption material, it is important to check the result. Start the engine and pay attention to any remaining sound leaks or areas with insufficient damping. If necessary, apply extra absorption material to the problem areas. This fine-tuning is crucial for achieving an optimal sound level. 

Do you have questions about how to insulate your boat or would you like to know more about the materials? Please contact us and we will be happy to help you further!