Science of Silence

Noise Insulation

What adhesives do I need to fit noise insulation?

Evo-stik, Sikaflex 291 which is available from your local chandlery or we also supply stick pins (Pt No. S007)

What about noise insulation for air-cooled engines?

Noise insulation can only be used with care, as it must not impede the flow of cooling air. Beware of solid mounted engines.

Can you supply the contact adhesive for the noise insulation materials?

Sorry but no we are not able to store or ship these glues. Please purchase from a builders merchants, chandlery or DIY store.

Are the insulation materials self adhesive?

We’ve never made a self adhesive material, as we couldn’t find a self adhesive which would take the weight involved and stay put in the extremes of temperature and damp found in a marine engine space. Modern adhesives have changed all this, and Halyard some years ago launched selected materials with self-adhesive backings for use on new installations only. The savings in labour, and the avoidance of problems with fumes will be enormous.

Will Halyard materials burn?

The foam will not. Some of the facings will. The noise absorbing foams used in all Halyard materials meet BS476 parts 6 and 7, which means you cannot set fire to them with a gas blowtorch.

The materials far exceed the EU standard required in the new Recreational Craft Directive, and Test Certificates are held proving this.

All Halyard materials meet the ISO 9094 fire standard required by the EU Recreational Craft Directive. Materials with Maritex facings are generally accepted by Lloyds Register of Shipping, and for some purposes by the MCA. Checks should always be made with the individual surveyor.

What about older boats with steel hulls?

Most of the noise will be structure borne with a solid mounted engine. The same applies with a steel hull. The Aquadrive anti-vibration system can reduce noise by 75% with such installations.

Halyard Noise Insulation Material - How do I use it?

The key is to clad as much of the engine space as possible, leaving no gaps for noise to get out, and no hard surfaces for noise to bounce off. Air flow to the engine needs to be considered and is discussed overleaf.


The insulation panels can be stuck with conventional thixotropic adhesive such as Evostick or Dunlop Thix-ofix. The containers will have manufacturer’s instructions printed on them and these should be followed carefully including those related to health, safety and disposal of empty containers.

As an alternative to traditional contact adhesives we recommend the use of Sikaflex 291 which is widely available from chandlers. This requires a separate method described on the tube and briefly under point 2 below. The following points should also be considered and where appropriate followed to achieve a successful lasting quality installation.

Full details on the installation process can be found in the Noise Insulation Product Manual, available in the Downloads Section of this website.