Planning a Radiant Concrete Pour? Compare an Above-Slab Option First

Before tubing is embedded in the slab, compare an insulated panel system that installs above concrete—designed to reduce downward heat flow, improve response and keep the system accessible.

WBI EPS panel systems combine insulation and guided tubing in one above-slab assembly. For many projects, this can be an alternative to embedding tubing in a new pour; the right choice depends on slab design, floor height, heat loss and finish flooring.

Request an Above-Slab Quote Talk to a Radiant Specialist

Built-in insulation
Faster response
Heat-pump ready
Design support available

Compare the Two Approaches

Embedding tubing in a pour uses the slab’s thermal mass. An insulated above-slab panel brings tubing closer to the finished floor and can respond differently.

Compare both before construction; the right choice depends on slab insulation, floor height, heat loss, finish flooring and system design.

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

WBI radiant panel company free sample box

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

WBI radiant panel company free sample box

Two Ways to Do It Only One Puts Heat Where You Need It

In-Slab Radiant

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

Over Slab Panel

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

WBI radiant panel company free sample box

WBI radiant panel company free sample box

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.

WBI radiant panel company free sample box

Built for How Homes Are Heated Today

Designed for lower water temperatures
Ideal for heat pumps
Even surface temperatures from optimized tube spacing
Faster response for better comfort control

WBI radiant panel company free sample box

WBI radiant panel company free sample box

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.

Start My Project Download Spec Packet

The Professional’s Choice for Radiant Floor Heating

Mechanical Contractor

“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

View The Project

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.

Request My Quote Talk to a Radiant Specialist

Design assistance available; design fees may be credited toward product purchase.

WBI radiant panel company free sample box

Put the heat where it belongs above the slab

Get My EPS Panel Quote Download Spec Packet Call: 877-924-3899

Find Your Panel Request Free Quote

Products

Ecowarm® RadiantBoard®Ecowarm® RadiantBoard® EPS Ecowarm® RadiantBoard® OSB ThermalBoard™ThermalBoard™ EPS Comparison Chart Talk to a Panel Expert Request a Free Sample

How It Works

How Radiant Heat Works Green Building & Zero Energy Air To Water Heat Pump

Applications

Over Concrete Wood Subfloor Remodel New Concrete Pour Walls & Ceilings Cooling

Compatible Flooring Goods

Tile or Stone Engineered Hardwood Traditional Hardwood LVP & LVT Carpet Laminate

Installation

Installation Support

Adhesive & Fasteners EPS Panels Over Concrete

Tubing and Manifolds Installation Gallery

About

Our Story Meet the Team Case Studies Customer Reviews

Resources

Trade Resources

Custom Home Builders General Contractors Architects Plumbers

Product Performance

Ecowarm® RadiantBoard®Ecowarm® RadiantBoard® EPS Ecowarm® RadiantBoard® OSB ThermalBoard™ThermalBoard™ EPS

877-924-3899 Find Your Panel Request Free Quote