I'm on my 3rd strip of backer rod. They do dry out, shrink, and become compressed. When you take the old one out, it will be a rectangular shape with depressions on both sides. On this last one, it still creaked for a few days after I installed it. I was about ready to trade off the truck when suddenly the noise stopped. Truck must have been reading my mind! At any rate, if yours is still creaking with new backer rod in there, give it a few days before you do anything drastic.
DB
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