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Bonfiglioli wall - does it meet criteria for CI?

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  • Bonfiglioli wall - does it meet criteria for CI?

    Hi All
    I like the idea of Bonfiglioli's wall design of a 2x6 wall with 1"foam strips and 1x3 strapping on top of that to form a 7.25" wall for rockwool r30 insulation. Seeing this extra space allows for r5+ insulation in the cavity combined with 1" foam strips of r5 on framing members will this meet building code requirement of r5 continuous insulation across all framing members?

    Also, has anyone used and lile this wall?


  • #2
    I haven't used the Bonfiglioli's method nor heard the term before. What building code requires continuous insulation across all framing members ? I've been out of day to day residential construction for several years, please educate me. It sounds like a Canadian or European requirement. You could achieve higher R value with 1" polyisocyanurate(R 7.4 I believe) fastened directly to the studs with the advantage of being able to tape the seams at each sheet, floor and wall without the extra strapping step. That would be a great help in air sealing. You'd have to use poly pans for electrical boxes and take extra steps in other areas such as partition intersections, rim joists, etc. Just a thought

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    • #3
      I haven't used Bonfiglioli's wall yet. I don't have enough information about it, can you tell me more about it?

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      • #4
        I've been adding strips of 1.5 foam and 1/2" plywood strapping on my 2x4 walls as I gut each room in my small house in upstate NY. Ripping all the foam and ply strips and attaching takes some time, but the extra 2" of mineral wool is more than worth it.

        If you have an r5 thermal break over your studs, I have to imagine that would satisfy the code requirement, yes.

        Ablesupe, in the first room I did in my house, I went with full sheets of foam. Made for a faster install, but in retrospect, if I have to open a wall for any reason, I'm going to have that extra layer to contend with and refit. Right after I finished that room, I learned of the bonfig assembly, and changed my process. My primary air sealing layer is zip sheathing outside, though I've been detailing the interior drywall as an air control layer as well.

        I think it's a great idea for remodel applications like mine, but I think exterior foam is a better way to go (keep that sheathing warm), if that's a possibility.

        -Dan
        Last edited by brassaw; 02-17-2020, 10:22 PM.

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