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Hi everyone. I either saw in FHM or on a tv dyi show a semi-rigid plastic product that is stapled on the underside of the roof shealthing between the rafters that creates an air space channel from the soffet vent to the ridge vent. The product is about 16" wide, 1" deep and curls up on the sides. The product allows you to then place your insulation batts tight to the ceiling without worring about blocking the soffit to ridge vent air flow. If anyone knows what I am talking about and has a resource, I would be indebted to you. Thanks to everyone for making this a great forum in which to get help.