For refrigeration circuits, the most important detail is to ensure that the external vapor barrier is intact. Without this, atmospheric moisture forms ice under the insulation which eventually bursts off. Although ice itself acts to some degree as an insulator, there is still considerable energy loss reflected in increased load on the refrigeration compressors.

Corrosion under insulation has recently been highlighted as a problem. This can occur if the external cladding allows rain to leak through. Also, wet mineral wool is a poor insulator so correct application and sealing of the external cladding is again important-as for low temperature insulation.

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