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I'd guess Tracy is talking about continuous
ridge vent. it is made of plastic and has construction very similar to
corrugated cardboard, that is two membranes separated with parallel walls
forming channels. plastic yard signs are often made of similar
material.
for larger channels and far more rigidity and
strength you might consider poly-carbonate. I use it for patio
roofs. I know it comes it 6,8,10mm thicknesses. unfortunately, I
moved recently and threw out all the drops I had.
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