The problem with plastic ridge-venting is the ridge venting starts warping and cracking with age. Most of the other fiber style ridge vents are easy for critters such as squirrels and mice to chew or tear out allowing easy access for bats and birds to enter the attic as well. 

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 The old way to “fix” the problem: Tearing of the ridge cap, removing the ridge vent, installing metal mesh, then installing new ridge vent.