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Detail showing rubber insulation on a hot gas refrigerant line. The insulation should be jacketed to protect it from sun and birds.

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Problems with insulation are not limited to whether there is insulation installed or not. Sometimes designers or contractors have made poor choices or have not adequately protected the insulation from environmental damage. This preceding photo gives an example of rubber closed cell foam insulation that has been attacked by birds. At the time this photo was taken, the insulation was less than one year old. When installed properly, this kind of insulation would have a PVC jacket which prevents damage from pests and from the ultraviolet rays from the sun, extending the insulation service life.