Which one is better to install the baffles if we're putting radiant barrier foil after the baffles(cardboard) and before R60 blown-in cellulose?

A. enter image description here

B. enter image description here

My pushback on A is that there will be a space between the barrier foil and the baffle and when we blow in the cellulose it will break the foil. While B will have direct contact with the foil to hold the cellulose together. Any thoughts or experiences like this?

  • You are asking to compare apples to oranges. Which one is your roof type? With this answer we can help better. Baffles are to allow air to flow. The best one depends on how your roof is made.
    – crip659
    Sep 18 at 19:15
  • Break the foil? Are you using a cannon to install the cellulose? The foil will absolutely not be damaged. Are you laying foil over the cellulose? How else would you get it out to the edges if you don't install it via foam board? I suppose you can attach it at the bottom and leave the top open for access. Please revise to explain that better.
    – isherwood
    Sep 18 at 19:32
  • We have an open gable roof.
    – Josh
    Sep 18 at 19:34
  • The above image is just an example. I forgot to add that we're just gonna use a cardboard. Some say that the foil will not withstand the weight of R60 insulation.
    – Josh
    Sep 18 at 19:38
  • @isherwood we're thinking about the compression of the insulation that can create a force plus the weight to push the foil and break it and start going to soffits.
    – Josh
    Sep 18 at 19:52


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