Insulation of Fishing Boats in Arctic Waters


The problem

Modern fishing boats are more or less floating food-processing factories. Most of the North European and Canadian fishing fleets operate in arctic waters, where the outdoor temperatures can be very low;

-30°C or below. The climate inside the ship is room temperature and the relative humidity, RH, is generally rather high due to the processing of fish.

It is unavoidable that vapour penetrates through the vapour barriers and forms condensation in the insulation. The effect is that the efficiency of the insulation is reduced and in many cases, the condensation water freezes. It happens that the ice will be so heavy that the insulation bursts and falls down.


The solution

A coat of 1,5 – 2,0 mm KEFA Coating is sprayed on the metal surface under the Rockwool insulation. The KEFA coat adsorbs the condensation water and stores it until the ambient situation allows the water to evaporate back into the air. The capacity of a KEFA coat of the actual thickness is ~ 1,5 litre of water per m2, which has shown to be sufficient to keep the Rockwool insulation dry.


The result

In 1988 and 1989 four fishing boats, NorØrn, Northern Eagle, Crystal Viking and Crystal Clipper were insulated with GrafoTherm under the Rockwool insulation. In the spring of 2000, the insulation of NorØrn was inspected. It was intact and no moisture related damages - deterioration of insulation material, mould or rust - could be observed.