Quote:
Originally Posted by Dynsol
Since moving in ( Eight years) I have always found my garage doors to be quite noisy when operating. They have been maintained on a regular basis in accordance with manufacturers guidelines.
I have been considering adding insulation from one of the various kit producers.
Question is: Is there a small, medium or large reduction in noise level if I proceed with this project?
Other suggestions for noise level are welcome. 
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I don't think insulation will reduce the noise much, if at all. The noise is not from the door panels, it is from the metal parts that move together, such as the motor, chain, hinges, and rollers that bump against the tracks that they ride in. I think, if you shop around and are willing to pay a lot more money, you can find a quieter garage door to replace the noisy one with.