Usually moisture build up appears as darkened stains on wood surfaces (usually starting at joints). Moisture damage to insulation is often difficult to identify without feeling the material for moisture. You should also look for mildew or mold that can accumulate on some insulation materials and attic wood and wallboard surfaces. Sometimes it can be difficult to locate moisture problems even when there is an obvious mildew odor. If you suspect moisture damage, it is best to have a professional inspect your attic.
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