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Community and Q&A

ICF connection to Tridipanel

Paul Minotto | Posted in Green Building Techniques on

I have an ICF wall that will have an EIFS on the exterior.  This wall will connect at a 90 degree angle to a Tridipanel with 1″ shotcrete on the exterior.
How would i treat the joint between the 2?  I assume there must be some need for flashing but i don’t have clue what to do.  Any advice would be most appreciated.
I’ve attached a detail that better illustrates the situation.  The home will be located in S. California, therefore minimal rainfall.

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  1. GBA Editor
    Martin Holladay | | #1

    Your question raises structural issues as well as water-management issues. Both categories of questions are probably beyond my pay grade, but here's some advice.

    1. Is it really necessary to use two wildly different types of concrete sandwich walls on the same building? Why invite this type of crazy challenge? Why not go 100% ICF, or 100% Tripanel?

    2. Pay an engineer to answer your structural questions. That's why engineers go to school, and that's why they charge so much for their fancy stamp.

    Shotcrete can't rot, and EPS can't rot, but rebar can rust. I don't know whether the placement of the rebar in the Tripanel might be subject to eventual rusting. When rebar in concrete starts to rust, the concrete busts apart. That's why reinforced concrete has a limited lifespan.

  2. Paul Minotto | | #2

    Hi Martin,
    Thank you for your advice.
    The only reason i'm using the tridpanels is to create a vaulted shell roof.
    I will consult with a structural engineer.

    1. Expert Member
      Akos | | #3


      I had an engineer spec a steel structure with a moment connection at the ridge for a gable roof/ceiling without ties. Would be much simpler/cheaper than shotcrete as the rest of the structure can be standard framing.

  3. Paul Minotto | | #4

    Here is a drawing that shows what i intend to build. It will be one complete insulated concrete shell, not unlike the ferro-cement structures that were built in Italy, Mexico and other S. American countries during the mid 20th century.

    1. Expert Member
      Akos | | #5

      That is why I prefer geometric shapes. Much easier to build with standard construction.

      Hard to tell from the sketch, if the roof is a single curve, two formed curved steel beams might still be easier than shotcrete. Transportation might be a challenge with something that big.

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