Insulating the Outboard Motor

What is the problem? Buitenboordmotor isoleren
The engine noise of the outboard motor is usually quite prominent, resulting in reduced sailing comfort, especially on longer trips. The thin and light plastic cover insulates little to no engine noise. The challenge is to apply the right material on the right spot. Below you can find which products are best to use.

What is the solution?
By seamlessly providing the inside of the cover with absorption material, the engine is wrapped, so to speak, and the noise level will decrease. The temperature under the cover determines which materials you can or cannot use, so check this carefully before applying a product!

Temperature up to 70 degrees
Absorbent materials to be used are Acousticell PU or Merfocell PU. These products are all self-adhesive and equipped with an oil and moisture-proof top layer. Tape the seams of these plates with Acustitape

Temperatuur 70 tot 110 graden
In this case, you equip the cover with an absorption material with a protective glass cloth fabric top layer. The products Merfocell FC and Flamex GW belong to this category. Both products are self-adhesive. Flamex GW is a rigid plate and only suitable for a flat surface.

Temperature 110 to 200 degrees
Do not use absorption materials in this case, but heat-resistant glass-based products. Ideally you should use Aluglass 15S. This product can easily be endure temperatures up to 200 degrees. The adhesive is resistant up to about 80 degrees. It may therefore be necessary to attach it mechanically with Adhesive pins or with screws and washers.

Is the motor located inside a transom? Then equip it with absorption material, this reduces vibration and thus the radiation of the sound to the surrounding environment. You can use Merfocell FC.

Below you will find all described products to insulate the outboard motor

  1. Plakpen B-63 | Voor mechanische montage
    Insulation Nails B-63
    Top plate (without Nelsoncap)
    • Mechanical Fixing
    • Heat-resistant mounting material
    • Can be cut to size

    Starting at £0.34

    (incl. tax)
  2. PU Finishing Tape
    PU Finishing Tape
    To close gaps between sheets
    • For finishing gaps between two panels
    • Oil, dirt and moisture-proof top layer, heat-resistant
    • Easy to keep clean

    Starting at £18.17

    (incl. tax)
  3. Acousticcell PU
    Acousticcell PU
    Dirt-resistant absorption foam
    • Moisture and dirt repellent
    • Application including engine compartment
    • Hygienic areas

    Starting at £28.01

    (incl. tax)
  4. Merfocell PU
    Merfocell PU
    Sound absorption with a top layer
    • Oil and moisture resistant top layer
    • Sound absorption
    • Self adhesive

    Starting at £32.40

    (incl. tax)
  5. Aluglass
    Sound-absorbing sheet
    • Fiberglass mat with sturdy aluminium foil top layer
    • Sound-absorbing, heat-resistant panel
    • Good alternative to flammable foam products

    Starting at £51.13

    (incl. tax)
  6. Flamex FC
    Flamex FC
    Absorption plate
    • Fiberglass cloth (FC) top layer
    • Heat-resistant Max. 150 degrees
    • For boats and vehicles

    Starting at £52.97

    (incl. tax)
  7. Merfocell FC
    Merfocell FC
    Heat Resistant absorption
    • Glass fibre cloth (FC) top layer
    • Moisture and heat-resistant
    • Applicable in engine compartments

    Starting at £57.96

    (incl. tax)

Sound insulation for yacht and shipbuilding
More information about insulating vessels can be found on the overview page 'Boats & Yachts'.