Ultra-Fin installs between your existing joists — aluminum fins spread heat across the full subfloor with no concrete, no floor build-up, and no structural impact.
Aluminum fins clip directly onto hydronic tubing suspended between your floor joists. The entire joist cavity becomes a radiant heating plenum — no contact with the subfloor required.
Works in new construction, renovations, and retrofits. Compatible with open web truss, I-joist, solid dimensional lumber, and engineered joists.
Full Technical Overview →
From the physics of fin-plate heat transfer to step-by-step installation guides — every detail, organized by topic.
In-cavity convection and radiant transfer — why fin plates outperform staple-up in every scenario.
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Fin geometry, spacing calculations, thermal resistance, and the physics behind even heat distribution.
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Side-by-side with traditional systems — no concrete, no build-up, and up to 50% less tubing.
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Works under hardwood, tile, vinyl, carpet, laminate, and slate — with any joist assembly.
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Requirements, layout guidelines, and what to expect — for new builds, renovations, and retrofits.
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Operating temps, flow rates, fin dimensions, insulation requirements, and design data.
Learn more →Three stages — inside the floor structure, invisible from every room above.
Tubing is suspended inside the joist cavity. Ultra-Fin aluminum fins clip directly onto the tubing — no drilling, no adhesive, no floor modification.
Heated water — typically 38–82°C — flows through the tubing. Heat transfers into the aluminum fins, which distribute thermal energy evenly throughout the cavity.
Fins emit radiant heat upward through the subfloor and drive convective airflow within the cavity — warming the entire floor surface, not just the strip above the pipe.
Contractors and homeowners across North America rely on Ultra-Fin for efficient, reliable radiant heat.
Our team can help with heat load calculations, tube spacing layouts, and system design for your specific project.