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What is everyone's experience with foam life span? In my experience, I have seen foam in other applications (cars, speakers, etc.) begin to crumble/lose its "structural integrity" after about 10 years. The construction foam seems to be more durable and has held up well in the instances where I have seen it after 10- 15 years. It does sound like the cardboard idea has its limitations. <br /> <br />Thanks for the input.
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