Stop Losing Heat to the Slab
WBI EPS panel systems bring radiant heat above the concrete—where it performs better, responds faster, and delivers real comfort.
Built-in insulation
Concrete Is Not Your Friend
Concrete absorbs heat. That’s its nature. When radiant tubing is placed inside a slab, a large portion of the energy is spent heating the concrete mass before you ever feel it at the surface.
Even in new construction, performance depends heavily on perfect insulation below the slab—and real-world conditions rarely match ideal assumptions.
What happens with in-slab systems:
- Heat is pulled away from the living space into the slab
- Slow response times make control difficult
- Energy is spent heating mass, not the room
- Performance depends on what’s under the slab, not in the room
Bring the Heat Above the Slab
EPS panel systems change the equation. By placing insulation and tubing above the concrete, heat is directed upward into the space instead of being absorbed downward into the slab.
This isn’t just a different install method—it’s a fundamentally better way to deliver heat.
What improves immediately:
- Faster warm-up and real-time responsiveness
- More usable heat delivered to the room
- Reduced heat loss into the slab
- Greater control over comfort
Insulation Where It Actually Works
EPS (expanded polystyrene) acts as a thermal break between the slab and the heating system. Instead of relying on what may or may not exist below the concrete, EPS ensures the system performs consistently.
EPS advantages:
- Helps reduce downward heat loss
- Improves system efficiency and response
- Supports consistent surface temperatures
- Makes performance predictable across projects
Two Ways to Do It Only One Puts Heat Where You Need It
In-Slab Radiant
Can be done—but comes with tradeoffs
Limitations:
- Heat must travel through the entire slab mass
- Slow response (often hours)
- Limited adjustability for real-world use
- Heat loss into ground if insulation isn’t perfect
- Not ideal for modern low-temperature systems
WBI EPS Panel Systems (Above-Slab)
Designed for performance
Advantages:
- Heat delivered just below the finished floor
- EPS layer helps reduce heat loss into the slab
- Fast response and better control
- Consistent performance regardless of slab conditions
- Ideal for heat pumps and efficient boilers
WBI Options:
- RadiantBoard EPS – higher output and responsiveness
- ThermalBoard EPS – lower profile, still insulated
Don’t Lock Performance Into the Concrete
In-slab systems are often chosen because they seem simple during the pour—but that decision locks your heating performance into the slab forever.
Above-slab EPS systems give you:
- Better control from day one
- Performance that isn’t dependent on below-slab insulation quality
- A system that responds to how people actually live
Ideal Applications
- Slab-on-grade homes
- Basements and lower levels
- Garage and shop conversions
- Additions with unknown or minimal slab insulation
- New construction seeking better performance and control
- Remodels where slab removal isn’t practical
Designed for Real Floors
Works with tile, stone, engineered wood, and many vinyl products.
Panel options allow you to balance insulation value and finished floor height.
Built for How Homes Are Heated Today
Not Sure If EPS Panels Are Right for Your Project?
Tell us about your slab, flooring, and heating goals. We’ll map out the right EPS panel system and layout—no guesswork.
The Professional’s Choice for Radiant Floor Heating
“Once you install above-slab with insulation, it’s hard to go back to in-slab.”
Radiant Contractor
Project: Slab-on-grade home, 1,400 sq ft • Heat pump
Outcome: Faster response and more consistent comfort compared to typical in-slab expectations
Frequently Asked Questions
Can I still do in-slab radiant?
Yes—but it typically results in slower response and less control compared to above-slab EPS systems.
Is above-slab really better for new construction?
In many cases, yes. It delivers faster response and more predictable performance without relying on below-slab conditions.
Will EPS stop heat loss completely?
No—but it helps reduce heat loss into the slab and improves overall system performance.
Will this raise my floor height?
Panel options vary. We help balance insulation and finished floor transitions.
Will it work with a heat pump?
Yes. EPS panel systems are designed for lower water temperatures.
Do you provide design help?
Yes—layout, spacing, and system guidance are available.
Get My EPS Panel Quote
Share a few project details and we’ll outline panel types, layout, and an installation path built for performance.
Design assistance available; design fees may be credited toward product purchase.
Put the heat where it belongs above the slab
