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hey just forget the reflective altogether go and get some 12mil plastic or better and staple it between the trusses then get soffit vent if u don't have it and run ridge vent also that way there's more then enough ventelation cause u just reduced the cubic footage of the house. With the ridge vent on my sisters house there was enough vent with vented aluminum soffit and 60 ft of ridge vent to vent a 3900 sqft attic and she only had 1600 sqft
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