Uploaded June 2012 | Updated September 2026, 2 days ago

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Learn a proven, practical method for attaching floor joists to Fox Blocks Insulated Concrete Form (ICF) walls using anchor bolts — before the concrete pour.

This step-by-step guide demonstrates how to install rim joists and anchor them to the ICF wall using basic tools and hardware. Ideal for multi-story ICF construction, this technique provides a reliable method for securing floor systems without compromising the thermal envelope.

You’ll see how to:

-Mark and cut out rim joist slots in the ICF block
-Use pruning saws or hot wire tools for precision
-Temporarily support rim joists with deck screws
-Drill and install anchor bolts for structural strength
-Maintain full insulation continuity in the wall
-This method is perfect for builders, contractors, and DIY ICF installers looking for a simple and effective floor attachment solution.

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