Metal jackets should contain moisture barriers on the inside. When corrosion of the jacket is the problem, plastic weather types are a good answer. Precautions with water and the insulation cement are needed if the piping or equipment is stainless steel. If certain combinations of metals cannot be avoided, paint the substrate metal.

For underground pipes, the pipe should be painted before it is insulated, and then a coating should be applied over the insulation. The pipe should be coated with a coal-tar epoxy or an extruded polyethylene jacket. A polyethylene jacket should also be placed over the insulation.

The most critical part of this system is protection of the field-made joints. Rigorous inspection methods are needed to ensure that joints are done correctly. An internally mounted anode beneath the primary weathering barrier and above the secondary coating has been found effective as an additional measure.