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What exactly are you trying to accomplish? You'll put at best R15 in the rafters if you're working with an old 2x4. R19 to R21 for an old 2x6. Why not put the baffles in the rafters, rent a blower from HD or Lowes and blow in fiberglass to an R40 value? You only need the baffles to extend above the blown insulation.
Can you post a pic of what you're working on?
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Nick
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