Radiant floor heating turns the floor into part of the heating system. In a hydronic system, heated fluid circulates through PEX tubing installed within a floor assembly, transferring heat to the surrounding concrete and the space above it.

A complete system involves more than PEX tubing alone. Insulation, tubing, a heat source, controls, and other components need to work together. Barn World's radiant floor heating systems include components for concrete-floor heating projects in garages, shops, basements, homes, and other applications.

How Does Hydronic Radiant Floor Heating Work?

Hydronic radiant heating uses heated fluid circulating through tubing installed in the floor. As the fluid travels through the PEX, heat transfers to the surrounding floor material. The heated floor then releases warmth into the space above it.

This differs from a forced-air heating system, which distributes heated air through ducts and registers. With radiant floor heating, the floor itself becomes part of the heat-distribution system.

The design of the complete system determines how the tubing is laid out, how many loops or zones are needed, what temperature the fluid operates at, and how much heating capacity is required.

The Main Parts of a Radiant Floor Heating System

Individual systems vary, but a hydronic radiant floor heating project generally requires several components working together. Understanding what each component does can make it easier to plan the project before the concrete is poured.

Insulation Beneath the Heated Floor

Insulation beneath a radiant floor helps reduce heat transfer into the ground or other areas below the floor. This allows more of the system's heat to be directed toward the slab and the space being heated.

Barn World's Crete-Heat insulated floor panels combine insulation with raised features designed to hold PEX tubing in position. The interlocking panels also include an integrated vapor barrier.

Crete-Heat panels are currently available in different thicknesses and insulation levels, allowing the panel to be selected according to the floor assembly and project requirements.

PEX Tubing

PEX tubing carries the heated fluid through the floor. The tubing is arranged in loops according to the heating-system design so heat can be distributed throughout the intended area.

Barn World's radiant heat PEX tubing is available for use with hydronic floor-heating systems.

Tubing size, spacing, loop length, and layout should be determined as part of the overall system design rather than chosen independently.

The Heat Source

The fluid circulating through the PEX needs a heat source. Barn World currently offers electric boilers for radiant floor heating as part of its radiant heating selection.

The appropriate boiler depends on factors such as the heated area, calculated heat loss, electrical service, system design, and number of heating zones.

Manifolds, Pumps, and Controls

A radiant heating system also needs components to move and control the heated fluid. Depending on the system, these can include manifolds, circulation pumps, thermostats, valves, and other controls.

The exact configuration depends on the number of tubing loops, heating zones, heat source, and requirements of the building.

Why Crete-Heat Panels Are Used Under Radiant Floors

Installing PEX tubing over an uninsulated surface can allow part of the system's heat to move downward instead of toward the heated space. Insulation beneath the tubing helps reduce that unwanted heat transfer.

Crete-Heat insulated floor panels provide both insulation and a surface for positioning the tubing. The raised panel design holds PEX in place without requiring the tubing to be tied to a flat insulation surface.

Barn World's current Crete-Heat selection includes panels with different insulation thicknesses. The appropriate thickness depends on the project, climate, floor design, building requirements, and available installation depth.

Plan the PEX Layout Before the Concrete Pour

Once a concrete slab is poured, changing the tubing layout is no longer a simple adjustment. The PEX layout should therefore be planned before installation begins.

Consider the total heated area, tubing spacing, individual loop lengths, manifold location, heating zones, exterior walls, doors, windows, and other areas where heat loss may differ.

The tubing should be installed according to the requirements of the heating system and the building project. Protect the tubing from damage during construction and verify the system as required before concrete placement.

Radiant Floor Heating for Garages and Shops

Garages and workshops are common applications for radiant floor heating because new concrete slabs provide an opportunity to incorporate insulation and tubing during construction.

Planning the heating system before the slab is poured allows the insulation, PEX layout, manifold location, heat source, and heating zones to be considered as part of the building design.

Large overhead doors, exterior walls, ceiling height, insulation, and the intended indoor temperature can all affect the heating requirements of a garage or shop.

Radiant Floor Heating for Basements

Radiant heating can also be incorporated into basement floor assemblies when the project is designed to accommodate the insulation, tubing, and concrete or other appropriate floor material.

Available floor height can be especially important in basement projects. Panel thickness, tubing size, floor covering, concrete or gypcrete depth, and finished ceiling height should all be considered before choosing the floor assembly.

New Construction Makes Planning Easier

Radiant floor heating is easiest to plan before the floor is built. New construction allows the insulation, tubing, plumbing, electrical requirements, manifolds, controls, and heat source to be coordinated before concrete work begins.

That does not mean every radiant heating project has to be new construction, but retrofit projects can involve additional limitations related to floor height, existing slabs, access, and the existing building structure.

Don't Choose Components Independently

One of the most important points when planning radiant floor heating is that the components form a system. Choosing tubing, insulation, or a boiler independently without considering the rest of the installation can create problems later.

Before ordering equipment, consider:

• The total area to be heated
• The building's heat-loss requirements
• The floor and slab construction
• The required insulation level
• PEX tubing size and spacing
• Tubing loop lengths and manifold locations
• The number of heating zones
• The available electrical service
• The required boiler or heat-source capacity
• Applicable building and installation requirements

Planning a Radiant Floor Heating Project

A radiant floor heating system works as a combination of insulation, PEX tubing, heated fluid, a heat source, circulation equipment, controls, and the surrounding floor assembly. Planning those components together is more important than focusing on any single piece of equipment.

For a more detailed discussion of Crete-Heat panels, insulation ratings, PEX tubing, boilers, applications, and system planning, see Barn World's radiant floor heating with Crete-Heat panels guide.

You can also browse Barn World's radiant floor heating collection to compare Crete-Heat panels, PEX tubing, electric boilers, and related components.