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In-Floor Heating

Radiant Floor Heating in Wichita: Decide Before the Slab Is Poured

Radiant floor heating is the one heating decision with a deadline: the tubing and the insulation under it go in before the concrete, and nearly everything worth knowing about it is worth knowing before then.

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Most heating decisions can be revisited. A furnace can be replaced, a thermostat moved, a mini-split added to the room that never got comfortable. Radiant floor heating is the exception: the tubing goes into the slab, the slab is poured once, and the building keeps whatever was decided that week for as long as it stands.

Which is why the conversation about radiant floor heating in Wichita tends to arrive at one of two moments. Either somebody has a shop, a barn or a house on paper and a concrete date coming, or somebody has a heated floor that has stopped behaving the way it used to. This is written for both, in that order.

It covers what in-floor heat does well in South Central Kansas, where it is the wrong answer, what has to be settled before the pour, and what can be checked on an existing system without anybody opening a floor.

How radiant floor heating works

The kind that suits a slab is hydronic: loops of tubing set in the concrete, with warm water moving through them. A heat source — usually a boiler — warms the water, a circulator moves it, and the slab takes the heat up and gives it off evenly across the whole floor. The floor is the radiator.

Every loop starts and ends at a manifold on the wall, where the loops are balanced against each other and can be shut off one at a time. Under the concrete and around its edge, insulation keeps the heat coming up into the room instead of soaking down into the ground. Controls decide when the water moves and how warm it runs.

Two things follow from that arrangement, and most of this article is one or the other. The parts that wear — the heat source, the circulator, the controls, the manifold — are all on a wall where somebody can reach them. The parts nobody will ever reach again, the tubing and the insulation, have to be right on the day the concrete arrives.

Red in-floor heating tubing tied in loops to a wire mesh grid over foam insulation board, the loops returning to a wall-mounted manifold, before the concrete is poured
Tubing tied in loops to mesh over insulation board, each loop returning to a wall manifold — the stage every in-floor system is at for a few days and never again.

Where it fits around Wichita: shops, barns and houses

The equipment is the same in every building. What changes is why somebody wants it.

Shops, barns and machine sheds

A concrete floor is the coldest thing in a Kansas shop in January, and it is the thing you are standing, kneeling and lying on. Heat from overhead warms the air and collects under the roof; heat in the slab starts where the work is. Nothing blows, so nothing carries dust across a finish that is still wet.

It is a natural fit for the outbuildings on acreages around Clearwater, Goddard, Andover and Douglass, where the shop often gets used harder than the house.

Houses, additions and basements

In a house the appeal is quieter. There is no moving air, so no draft, no register to keep the furniture off, and nothing to hear when the heat comes on. A new build on a slab, a slab-on-grade addition or a basement floor are where it goes in most simply, for the same reason as a shop: the concrete is being poured anyway.

Floor finishes matter here in a way they do not in a shop. Tile and finished concrete pass heat readily, thick carpet and pad hold it back, and some wood and vinyl products carry limits from their manufacturer that are worth reading before the flooring is ordered.

Where it is the wrong answer

It heats and it does not cool. A Kansas summer still needs an answer, and in a slab building with no ductwork that is usually a ductless mini-split.

It also suits a building used most days far better than one used now and then. A slab takes hours to warm, not minutes, so a shop visited two Saturdays a month either holds a temperature all winter or is never warm when you arrive. And once a slab has been poured without tubing, adding it is a much bigger job than the one that was skipped — at that point a ductless system is usually the practical route.

What a Kansas winter asks of radiant floor heating

South Central Kansas does not have one kind of winter day. It has hard cold, it has wind, and it has days that start below freezing and finish in shirtsleeves. A heated slab answers each of those differently from a furnace.

Cold mornings and warm afternoons

A slab is slow on purpose. It takes hours to warm and hours to cool, which is what makes it even — and what makes it lag when the weather turns quickly. On a day that swings from a hard frost to a mild afternoon, a floor heated for the morning is still giving that heat back after lunch.

That is a controls question, not a flaw. A system that reads the outdoor temperature and the slab itself handles those days far better than one that waits for the air in the room to feel cold. It is also why turning the heat down at night and back up in the morning, the habit a furnace rewards, does very little for a slab. Pick a temperature and leave it there.

The overhead door and the wind

Open an overhead door in January and the warm air leaves in about the time it takes to drive a truck through it. With warm-air heat, that was the heating. With a heated slab it was not: the heat is stored in the concrete and in everything sitting on it, and the air comes back up without the system starting from nothing.

Wind is the other half. It finds every gap in a metal building, and it pulls heat out through an uninsulated slab edge all winter — which is the first of the things to settle before the pour.

The building that sits empty

Water in a slab is a liability in a building that might go unheated: a shop on a second property, or a barn through a power outage in an ice storm. Whether the system runs on plain water or on a freeze-protected mix is a design decision, made at the start and checked periodically afterwards, and it is decided by how the building is actually used.

What to settle before the slab is poured

This is the part with a date on it. None of these is complicated, and all of them are far cheaper to decide on paper than to regret in concrete.

The tubing and the insulation are also the only parts that have to go in before the concrete. If the budget for the building is already spoken for, it is worth asking whether those two go in now and the heat source follows later — a slab poured without them has made the decision for you.

The one deadline

Tubing and insulation go in before the concrete. Everything else about an in-floor system can be reached, adjusted or replaced later. Those two cannot.

Before the forms are set, have an answer for:

  • Insulation under the slab and around its edge. It cannot be added afterwards, and it decides how much of the heat you pay for ends up in the room.
  • Zones. A shop bay, an office and a bathroom want different temperatures, and that is settled by how the loops are laid out and grouped.
  • Where the manifold and the heat source go — on a wall that stays accessible, not behind shelving that has not been built yet.
  • Anything that will be anchored to the floor: a vehicle lift, racking, a wall that might go up later. Tubing is routed around those, and it can only be routed around what somebody mentioned.
  • A record of where the tubing runs. Photographs with a tape measure in frame, taken before the pour, are the cheapest insurance in the building.
  • A pressure test. Tubing is tested before the concrete arrives and kept under pressure through the pour, so that damage shows on a gauge while it can still be reached.
  • The fuel at the building. In town that usually means natural gas; farther out it is often propane or electricity, and the heat source follows from it.
  • Summer. A heated slab does nothing in July, so the cooling plan belongs in the same conversation.
  • The controls: what the system reads, and whether it watches the slab and the weather or only the air.

The right time to ring us is while the building is still a drawing. The second-best time is before the forms are set.

Signs an existing in-floor system wants looking at

A heated floor gives very little away. There is no blower to hear and no register to hold a hand over, so the signs are quieter than a furnace’s and they tend to arrive gradually. These are the ones worth writing down.

In-floor heating warning signs

Things you can see, hear or feel without taking a cover off anything — all of them worth mentioning when you call:

  • A part of the floor that used to be warm and no longer is, or one zone that has stopped keeping up with the others.
  • The whole floor taking noticeably longer to come up than it did last winter.
  • A thermostat calling for heat while the floor stays cold.
  • The heat source running far more than it used to, or starting and stopping in short bursts.
  • A pressure gauge at the heat source or the manifold reading differently from where it normally sits.
  • Gurgling, rushing or knocking at the manifold or in the piping.
  • Water, staining or crust on the fittings at the manifold, the circulator or the heat source.
  • A damp patch on the slab, or on the wall below the manifold, that was not there before.
  • A circulator that has become noisy, or is silent when the system is calling for heat.
  • Fuel use that has climbed without the weather explaining it.

Every one of those has more than one possible explanation, and which applies is measured, not guessed. Tell us what it is doing and when it started.

If you ever smell gas near the heat source, none of this applies. Leave the building and call the gas utility from outside.

What a technician checks without opening a floor

Most of an in-floor system is behind concrete, and that is exactly why the diagnosis starts everywhere else. The heat source, the circulator, the manifold and the controls are all on the wall, and between them they account for most of what can be measured — including a good deal about the loops nobody can see.

On an in-floor call we are working through:

  • The heat source: how it fires, its safeties, its venting, and its combustion where it burns fuel.
  • System pressure, and whether it holds.
  • Supply and return temperatures at the manifold, loop by loop — which is how a floor nobody can see into gets read.
  • The circulator: whether it runs, whether it is moving water, and what it draws against its nameplate.
  • Air in the system, and the means of getting it out.
  • The controls: thermostats, any slab or outdoor sensors, zone valves and how the water temperature is being set.
  • The expansion tank and the relief valve.
  • The fluid in a freeze-protected system — its condition and how much protection it still gives.
  • A suspect loop on its own, isolated and pressure tested at the manifold.

The conversation about concrete comes last, and only after the readings have ruled out everything on the wall.

Common questions

Is radiant floor heating worth it in Kansas?
It depends on the building more than on the state. Our winters are cold enough and long enough for a heated slab to earn its place in a building that is occupied most days — a working shop, a house, a barn somebody is in every morning. It is a weaker fit for a space used occasionally, because a slab takes hours to warm, and it does nothing about summer, so the cooling still has to come from somewhere else. The honest way to answer it for your building is to look at how the space will be used and what the slab and insulation are going to be.
What does radiant floor heating cost to install?
There is no honest figure per square foot, and we would rather not print one that turns out to be wrong for your building. What moves the number is the area being heated, the insulation under and around the slab, how many zones there are, the heat source and the fuel available at the site. The useful step is to show us the plans before the concrete is scheduled; a quote written against a real building means something, and one written against a floor area does not.
Can radiant floor heating cool a building in summer?
No. In-floor heat is a heating system only, and a Kansas summer needs its own answer. In a shop or an addition with no ductwork that is usually a ductless mini-split, which also covers the mild weeks in spring and autumn when the slab is more than the building needs. The two are best planned together, before the slab goes down, even if they are installed at different times.
Should I turn in-floor heat down at night?
Generally not. A furnace recovers from a setback in minutes, so turning it down overnight makes sense. A slab takes hours to give up its heat and hours to get it back, so a nightly setback mostly means the floor is still catching up at the time of day you wanted it warm. A steady setting suits the way the system works, and a longer absence is a different question that is worth asking about for your particular building.
Can I drill into or anchor to a heated slab?
Only where you know the tubing is not. That is the whole reason for taking measured photographs before the pour and for saying, at the design stage, where a lift or racking is going to stand. If no record exists, the loops can usually be located from the surface while the system is running, because the floor is warmest directly over them. Find out before the drill comes out — a damaged loop under concrete is the repair everything else in this article is arranged to avoid.
Do you service in-floor systems you did not install?
Yes. We service existing in-floor systems as well as installing new ones, and we work on all makes and models. If yours has stopped performing, we find out why before recommending a replacement of anything — and because the parts that wear are on the wall, the answer is very often there and not in the floor.

Your first and last call

Talk to Us Before the Forms Are Set

Radiant floor heating rewards the people who asked early. If there is a shop, a barn, an addition or a house on paper anywhere in the Wichita area, the useful moment to bring us in is now, while moving a manifold or adding a zone costs a pencil line. If the floor is already down and has stopped doing what it used to, the order is the same as on every job of ours: find out why first, then talk about what it needs.

More than twenty years installing and servicing heating and cooling across Wichita and South Central Kansas, residential and commercial, on all makes and models — in-floor systems in homes, shops and barns among them. Fairly priced, and you know what is involved before any work starts.

Call 316-807-1713 while the building is still a drawing.

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