A polished concrete floor can serve as the exposed finish over a radiant-heated slab when the heating assembly and the floor are designed together. The two scopes belong to different trades. The radiant specialist controls the heating system’s design, installation, commissioning, and performance. Craftsman coordinates the slab and finish interface, planning the polished floor surface around the embedded system. On a new slab, that coordination starts before concrete is placed, while tubing or cable layout, joints, and the finishing sequence can still be planned as one assembly. On an existing slab, the options narrow. A heating system applied on top of the slab is covered by a new cementitious layer, so the original surface does not remain the exposed finish. The working question for a project team is not whether the two systems can coexist — it is which trade answers each design question, and in what order.
The Coordination Boundary Between Trades
Radiant-heated polished concrete is one assembly built by several trades. Projects run cleanly when each design question is assigned to the party that controls the answer.
The Radiant System Belongs to the Radiant Specialist
System selection, heat output, controls, tubing or cable layout, installation, testing, and commissioning belong to the radiant specialist, and so does the system’s performance in service. Craftsman does not design, install, commission, or warrant radiant heating systems. Operating temperatures, response behavior, energy use, and service life are established by the radiant designer for the specific system and building, so questions about them go to that designer.
Craftsman Coordinates the Slab and Finish Interface
The slab and finish interface is the set of points where the polished-concrete work meets the slab that contains the heating system. Coordinating it includes when the polishing scope enters the construction sequence, what the finish work needs to know about the embedded layout, and how joint, repair, and surface decisions inside the flooring scope are kept consistent with the heating design. The heating system itself never transfers into the flooring scope. Craftsman delivers the coordination, and responsibility for the system stays with the radiant specialist.
The Documentation the Interface Depends On
Interface coordination runs on documents. The records that matter are the as-installed layout of tubing or cables with their designed depths, the joint plan, the testing and commissioning requirements stated in the project documents, and the specified finish. When those records exist and are shared, every later trade, flooring included, can plan its work around the embedded system. When they are missing, the gap is resolved with the radiant specialist and the design team before surface work is scheduled.
New Slabs: Planning Radiant and Polished Concrete Together
New construction is the clean case for a heated concrete floor, because every layer of the assembly can still be decided.
How the Heating System Sits in the Slab
Hydronic systems circulate heated water through tubing placed in the slab; electric systems embed cables or heating elements the same way. Both are installed when the slab is built. The concrete’s thermal mass then works as a large, even heat emitter, and the same slab that carries the heat is the slab whose surface is later refined into the finished floor, so the two scopes cannot be designed in isolation.
Sequencing the Work Around the Heating System
The order of operations is set in the project documents, and the interface points are explicit. If the design calls for sub-slab or edge insulation and vapor control, those layers go in before placement. Testing requirements, including any tests the system requires around concrete placement, come from the radiant specialist and the project documents. Placement, finishing, and curing belong to the concrete scope. Polishing is scheduled against those requirements for the specific project, and commissioning of the heating system follows the radiant specialist’s procedure. Sequencing questions that cut across trades are settled in coordination. Project teams working through slab-level decisions can start with the slab coordination guidance for project teams.
Grinding, Penetrations, and the Embedded Layout
Polishing works the top of the slab; tubing and cables sit within it, at depths set by the radiant and structural design. Later trades may also cut, core, or anchor into the floor. The control for all of it is the as-installed record. Accurate layout, depths, and joint locations let surface work — and any specified sawcuts, anchors, or repairs — be planned away from the embedded system. The record is produced during construction and preserved, because reconstructing it afterward is difficult.
Appearance Review Before Production Polishing
How the finished appearance will be reviewed and accepted is agreed in the project documents before full-area polishing begins. On a heated slab, that review is planned around the commissioning constraints the radiant specialist sets, so appearance decisions and system requirements do not collide late in the schedule.
What a Retrofit Changes on an Existing Slab
On an existing slab the decision structure is different, because a heating system added on top is covered by a new layer that becomes the top of the floor.
A Top-Applied System Covers the Original Surface
Thin electric mats or cables can be applied over an existing slab, and they are then covered with a cementitious layer. That covering layer becomes the top of the floor, and the original slab surface, polished or not, no longer serves as the exposed finish. Whether the new assembly can be finished to the project’s target is a design question about the specified topping, and it is answered before the heating system is selected.
Keeping an Existing Slab Exposed
When the goal is to keep the existing slab as the exposed polished floor, a top-applied heating layer conflicts with that goal by definition. Whether any heating approach can serve the space without covering the slab is a question for the radiant designer, and the flooring scope is planned only after it is settled. Where the slab will remain the finish, whether an existing slab is a candidate for polishing is a separate question that depends on the condition of the slab itself.
Constraints the Design Team Resolves First
A retrofit assembly adds layers, and added layers change floor elevation at doors, thresholds, transitions, and fixed equipment. How much depends on the specified assembly. Structural capacity for added toppings, the condition and moisture behavior of the existing slab, and available electrical or mechanical capacity are evaluated by the project’s designers. Craftsman’s contribution at this stage is scope review, confirming what finish is achievable on which surface of the assembly and what the flooring scope needs from the other trades to deliver it.
An Early Scope Review Brings the Pieces Together
What a Scope Review Needs
A useful review starts with the project’s real parameters: location; floor area and intended use; whether the slab is new construction or existing; the radiant system type, if one has been selected, with its documentation; available drawings and specifications; the target finish; floor-height constraints; the schedule; and contact information for the radiant designer or installer so interface questions go directly to the responsible party. Pricing follows the same structure. The radiant system, the slab or covering layer, and the finish work are separate scopes, and how polished-concrete pricing is scoped is its own conversation.
When to Start the Conversation
The time to begin is before the slab is placed, or before a retrofit assembly is locked, while every option is still open. Questions raised then are still design questions. To start a scope review, send plans, slab information, and whatever radiant documentation exists to projects@craftsmanconcretefloors.com, or call +1 (844) 687-1961.
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Frequently Asked Questions
Yes, when the heating assembly and the floor are designed together. The heating system is embedded in the slab, and the slab surface above it becomes the finished floor. The radiant specialist controls the heating system’s design, installation, commissioning, and performance, and Craftsman coordinates the slab and finish interface, so each design question is answered by the trade that controls it.
The radiant specialist designs and installs the radiant heating system. System selection, output, controls, installation, testing, and commissioning are the radiant trade’s scope. Craftsman’s scope is the slab and finish interface, coordinating the polished-concrete work around the installed system.
No. The radiant specialist controls the heating system’s design, installation, commissioning, and performance, and the project’s controlling documents govern its obligations. Craftsman’s responsibility is the slab and finish interface and its contracted polished-concrete work.
Radiant heat can be added to an existing polished concrete floor only by changing the assembly. A heating system applied on top of an existing slab is covered with a new cementitious layer, so the original polished surface does not remain the exposed finish. The finished floor is then rebuilt above the heating layer under the project’s design. Whether any heating approach can serve the space without covering the slab is a radiant-design question, settled before the flooring scope is planned.
That selection belongs to the radiant designer. Hydronic systems circulate heated water through tubing in the slab; electric systems use embedded cables or mats. Which fits a given building depends on factors the radiant specialist evaluates, including energy costs, project size, and the heating design. The flooring consequence is the same either way. The embedded layout must be documented so the surface can be finished and later work can be planned around it.
Polishing begins when the project’s own sequence allows it, and that sequence is set by placement, finishing, and curing in the concrete scope together with the testing and commissioning requirements from the radiant specialist and the project documents. The polishing start is confirmed against those project-specific requirements, because no universal calendar applies.
Grinding and polishing are planned to avoid embedded tubing and cables, and the safeguard is a documented layout. Polishing refines the surface of the slab, while tubing and cables sit deeper within it, at depths set by the radiant and structural design. When the as-installed record of layout, depths, and joint locations is available, surface work and any specified sawcuts, anchors, or repairs can be kept clear of the embedded system.
Maintenance runs as two separate scopes. The floor surface is cared for as a polished concrete floor, while the heating system, including its controls, mechanical and electrical components, and embedded elements, is serviced under the radiant specialist’s documentation. Keeping the as-installed system record with the building’s closeout documents protects both scopes whenever later work is planned.
There is no single number, because the work is three scopes priced separately. The radiant system with its controls, the slab or covering layer that contains it, and the polished-concrete finish work are each priced by the party responsible for that scope against the project’s actual design. Early coordination produces a complete picture before commitments are made.
A scope review request should name the project basics and the responsible parties. The basics are the location, the floor area and intended use, whether the slab is new construction or existing, the target finish, any floor-height constraints, and the schedule. The system side covers the radiant system type, if one has been selected, along with available drawings or specifications and contact information for the radiant designer or installer, so interface questions go directly to the responsible party.
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