What is the life of insulation?

Our home was built in the mid 50s. The attic area has some form of insulation which practically disintegrates when stirred with a prod. Is this still functioning or has it deterioated? It is very powdery when stirred. What is the normal life of insulation and when should it be replaced?

Answers:

From: Steve Farmer

usually, insulation lasts for about 50 years. i think just to make sure that your insulation won't be creating health and home risks to your family, better replace it with a new material.

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