Having set the task of arranging a warm floor under linoleum on a concrete floor, it is necessary to solve a difficult problem. Although linoleum in the construction market is presented in a large assortment, not everything that is offered can withstand temperature loads. With the technology of the device and the choice of materials it is worthwhile to understand. Is it true?
We will talk about how a floor heating system is constructed on a concrete base with the subsequent laying of linoleum. Our proposed article sets out in detail all the stages of construction: from the selection of materials to finishing finishing works. Popular device options are described.
Secrets of the device underfloor heating under linoleum on concrete
Despite its great popularity, this material is hardly the best option for finishing coatings on underfloor heating. Good heat-insulating properties, changes in shape and color under the influence of high temperature are not all of its disadvantages. The probability of release of harmful substances during heating is the main disadvantage of this flooring.
However, if you do not want to see anything other than linoleum on the floor, you can lay a warm floor under it, but not all types. The most suitable types of underfloor heating in this case are water and electric, which include infrared and cable views.
Mandatory conditions - installation in accordance with all the rules and strict adherence to the temperature regime. There are separate requirements for a concrete base. It must be prepared so that there are no differences in height. It is considered acceptable if on an area of 2 m² the difference in irregularities does not exceed 0.2 cm.
The base requires thorough cleaning, followed by the application of a primer and a waterproofing layer. To balance the expansion that occurs during the work of the floor, the walls along the perimeter of the bottom are formed with a compensation tape made of foamed polyethylene.
Since many brands of linoleum are equipped with a substrate that can independently act as a heater, not all of its types will be able to miss the thermal rays of heating systems
Which linoleum to choose?
Linoleum, present on the market, despite the visual similarity, differs in different parameters. It may have a different thickness, composition, structure, and the hardening base, if present, may differ in type.
When choosing linoleum, you need to correctly use the information encrypted in the markings affixed by the manufacturer. It encoded information about the composition of this type of coating, the possibility of heating, the maximum allowable temperature.
You should immediately remove from your list material based on glyphthalic polymer, i.e. alkyd linoleum. It is a low thermal conductive coating, and over time changes its size. For the installation of underfloor heating, these properties are a big minus.
An unsuitable option is coloxylin linoleum based on nitrocellulose, which is highly combustible. Although the composition of such linoleum contains flame retardant acid, which slightly reduces the fire hazard of the material, it is not advised to arrange underfloor heating under it.
If the selected linoleum is recommended by the manufacturer for laying paired with a warm floor, it has such permission marking as in the photo
Rubber linoleum relin should also not be considered. In addition to being a good heat insulator, when heated from below, the material can change the structure. This will quickly lead to its destruction.
Polyvinyl chloride linoleum with good strength and hygienic characteristics, is suitable for a warm floor more than other types. A more expensive option is natural linoleum (marmolium), created on the basis of safe components.
It contains jute fabric, natural dyes and other natural ingredients. The main rule: PVC linoleum can only be heated up to 30⁰, and natural - up to 27⁰ maximum.
When choosing PVC linoleum for finishing a warm floor, it is better to consider not its domestic appearance, but commercial or semi-commercial, as more durable. A heat-insulating base for this purpose is not needed, it will only reduce the effectiveness of the system.
The material is more suitable either with no base at all or with a very thin fabric substrate. At first, vinyl linoleum paired with a heating cable may produce an unpleasant odor, but then it will disappear.
Concrete floor device
Immediately solve the problems associated with the installation of the “Warm floor” system on a concrete base, and you can choose the appropriate type of linoleum when the rough floor already exists. If instead of it there is only an old rotten wooden base or just soil, you need to deal with the device of the concrete floor itself.
The process consists of several stages:
- disassembling the old floor, if any;
- alignment of the base;
- cushion devices;
- arrangement of the insulation layer;
- preparation and pouring concrete mortar.
Leveling the soil is carried out using a shovel. Then they begin to create a pillow. For this, crushed stone or small pieces of brick, broken slate are poured to a height of about 50 mm. All this is a little rammed.
The perimeter of the room is closed with a foam sheet having a thickness of 20 - 50 mm. It will serve as a formwork, and at the same time balance the thermal expansion of the concrete base. Pure sand is poured on this layer - 10 centimeters.
Then follows the laying of the second type of insulation. Most of all, extruded polystyrene foam is suitable for this, preferably Penoplex, which is produced in the form of rigid plates with a thickness of at least 50 mm.
Expanded polystyrene or foam polystyrene is resistant to temperature changes, environmentally friendly, well tolerates compressive loads, moisture resistant, durable
On the sheets, the manufacturer provided for a locking connection, so when they are laid, there are no gaps. During installation, you must monitor the horizontal with the help of a level. Waterproofing is not needed here, because The material is extremely resistant to moisture.
The next step is the preparation of the solution. The optimal ratio of components is 1 part of cement, twice as much sand and three times as much screening. As a result, the solution should not be fluid, but not excessively thick.
In order not to heavily load the floor, light fillers and levelers are introduced into the concrete solution. Before pouring the solution, beacons are set against the walls, a cord is pulled between them. Guided by these marks, intermediate marker rails are placed.
A cement base of a traditional composition with a height of 10 mm weighs about 20 kg, so it can only be used when a warm floor is installed on the ground floor of the house or when there is a very strong floor under it
The surface is moistened and the solution between the beacons is laid out on it and leveled as a rule. As it sets, the surface is leveled. At the end, apply a building level to check horizontality. After removing the labels, the resulting voids are poured with a solution and all is left to dry completely.
Infrared film on concrete floor
This version of the heating floor is the most loyal to linoleum, but the thin film is easy to damage, so the concrete base under it should be perfectly smooth. For efficient heat transfer by infrared heaters, this process must take place in one direction.
Any other “warm floor” system functions on the same principle. One-sided heat transfer is possible only in the case when the thermal conductivity of materials located below and above with respect to the heating elements is radically different.
The heat capacity of the top layer should be significantly higher than that of the subfloor. Under these conditions, the efficiency of the infrared floor can reach 97%. At the same time, installation of this system does not introduce significant adjustments to the room parameters in height.
Underfloor heating components: concrete base (1), heat-reflecting substrate (2), infrared floor (3), polyethylene film (4), plywood sheet (5), adhesive layer (6), linoleum (7)
To lay the infrared film on the concrete floor, you must first install the thermal cut-off. After this, work begins, preceding the laying of linoleum.
Features of the shielding layer and its installation
Due to its high reflectivity, a heat shield can reduce heat transfer to a concrete floor by an average of 75%. The best option is a foil coating with a base of lavsan.
There are other cheaper metallized materials made on the basis of foamed polyethylene, but their thermal conductivity is higher, so the heat loss will also be large. A rational approach to this issue involves the acquisition of an electrical and thermal insulation system together with heating elements.
It is better when all this is released by one reputable manufacturer. The quality of insulating materials is a guarantee of rational energy consumption for heating. A heat shield is only needed in places where the film is laid, but it is better to lay it over the entire area in order to avoid unevenness.
Installation is carried out in the following sequence:
- Lay out thermal strips on a concrete base, directing the reflecting side up.
- Separate the stripes with double-sided tape.
- They put a temperature sensor between the tapes and fix it with tape.
- Connect the wires to the sensor and the regulator, protecting them with a box or hiding them in strobes made in concrete.
The good quality of infrared films and components produced by manufacturers such as Q-term, Lavita, Enerpia, Rexva, noted by many consumers. They have approximately the same technical characteristics, and the difference in cost is a feature of the pricing policy of a particular company.
The choice should be made according to the bandwidth and maximum power. For linoleum, the optimum power is 150 W / m². With this value, the structure of the coating does not change and no harmful substances are released.
Mounting an infrared film
To minimize the number of segments and connection points, stripes are placed along the room. Before laying the film is divided into parts. The length of the cloth depends on its width. For a meter film, let's cut into segments up to 7 m long, with a width of 0.8 m - 10, and for a half-meter canvas, the maximum length of the thermal strip is 13 m
It is better to connect the units with a wire of PV - 3.1 x 1.5, which will ensure their minimum heating in the event of a peak load of 10 A. The VVGng cable is used to power the thermostat. Units individually connect each to a temperature controller or the nearest junction boxes
Proper layout - the indent from the walls is 200 mm, the gap between the strips is from 30 to 50 mm, the contacts are as close as possible to the wall on which the thermostat will be placed.
In no case should you allow overlaps. Thermo cloth, using masking tape, is attached to the heat shield. Slices on the sides are also fixed using screws or staples.
At the edges of the copper strip of the film, located in close proximity to the thermostat, put on tips. A power wire will be connected to them. It is inserted into the tip and pressed with pliers. The cuts and connection points of the wires on both sides are insulated with bitumen tape. The bands are connected in parallel.
Upon completion of laying, connect the wires connecting these elements to the infrared film to the temperature controller and temperature sensor. Check the correctness of the connection, then test the operation of the system on a concrete base.
If everything goes according to plan, the canvas is covered with a plastic film, making an overlap of 20 cm, then the waterproofing is fixed with tape.
Laying linoleum on top of the IR system
This material does not differ in particular rigidity, therefore, in order not to deform the heating elements when walking, a leveling layer is necessary for it. They make it from plywood with moisture-resistant properties with a thickness of about 0.8 cm.
In order to prevent damage to the film when fixing plywood sheets, it is necessary that the fasteners fall into the technological gaps provided between the heating elements or at the edges of the film. The mounting pitch is about 150 mm.
Plywood liner under linoleum will compensate for small bumps and cracks in the concrete base, and the finish will last longer
When laying between walls and sheets of plywood, compensating gaps of 0.1 - 0.2 cm should be left. Subsequently, they are filled with a moisture-proof sealant. After the sealant dries, dust is removed from the entire surface with a vacuum cleaner. Further, the plywood is primed, the primer is allowed to dry and the linoleum is laid in the usual way.
Cable electric floor
When laying the cable system, the concrete floor is first leveled, then a reinforcing mesh or a special fixing tape is laid on it. A cable is placed on it, fixed, then poured with concrete mixture. When the screed is dry, lay linoleum.
Before all these work, determine the length of the cable. If it is placed in increments of 15 cm, approximately 25 cm will go into one loop.
With the known area of the room in which the heating floor is to be installed, the number of turns, branches of the cable and its length as a whole are calculated. To the obtained value is added the segment going from the screed to the wall where the thermostat is located.
When calculating the area covered by the warm floor, the obligatory five-centimeter indent from the walls and the space occupied by the furniture are subtracted from its total value. Thermal insulation is applied to a clean concrete floor over its entire area. Glued joints with foil tape.
In the area reserved for the installation of a warm floor, a metal tape is laid to secure the cable so that it is enough for the entire area. Space is provided on the wall for the regulator. Then make a hole for the installation of the mounting box and lay the strobes. After mounting the controller, a temperature sensor is attached to it.
A wire coming from the heating elements is laid to the temperature controller. A temperature sensor mounted in a corrugated pipe and a cable from the main power supply are also brought here.
The heating cable is laid starting from the edge of the corrugated tube, on which the cable end sleeve must be present. The electric floor is assembled, adhering to the calculated step in the form of a snake, the branches are laid evenly, excluding creases in turns. The heating cable is fixed with hooks available on a previously laid metal tape.
Pull it tightly, but still the cable should be as straightforward as possible. The step is calculated by multiplying the heated area by 100, followed by dividing the result by the length of the cable.
After a short trial of the system, pour a 5-centimeter layer of screed. When it dries, mount the topcoat.
Water flooring
The water heating system goes well with the concrete base. But the final coating of linoleum is not the best choice in this case. Nevertheless, a certain type of linoleum can be laid. The main thing is that it is not thick and low quality.
The scheme should be thought out in advance. A waterproofing layer is laid on a previously prepared base. At the joints between the strips tape strips are glued. Plate thermal insulation is placed on top, which is fixed with special fasteners - “fungi”, under which holes are pre-drilled.
In the collector, the temperature of the water at the inlet to the system decreases, because here the heated coolant is mixed with cold. In addition, this device is responsible for adjusting the volume of coolant supplied separately to each circuit
Using the same “fungi”, a reinforcing mesh is attached to the insulation, performing an overlap of the size of one cell and using plastic clamps to connect the individual strips. A collector is installed on the wall, subsequently pipes are connected to it. Compensate for the thermal expansion of the floor by gluing on the walls surrounding it with a special tape.
After that, you can attach the pipes forming the heating circuit to the reinforcing mesh, and then connect them to the collector. A more perfect way to fix the underfloor heating pipes is to use a mounting system specially designed for this with click clips or guide clips. It is fixed on a concrete base before laying the pipes.
Such a system of fastening tubes guarantees accurate pitch adjustment, reliable fastening, preventing them from shifting during pouring of the screed and its solidification
To start filling the screed on the water floor, the pipes must be filled with water, and beacons installed on the floor and level them with the laser level. A screed with a minimum thickness of 40 mm is poured according to the same rules as when installing other types of underfloor heating.
Floor design with linoleum can be performed no earlier than in a month. During this time, the cement screed will gain the necessary strength. Up to this point, you can not put into operation a water heated floor.
The following article will familiarize with the technology of constructing a heating system under linoleum on a wooden base, which will thoroughly analyze the rules and features of such a system.
Video # 1. A visual lesson on the installation of the ideal screed for underfloor heating:
On the one hand, the technology of installing a warm floor under linoleum on a concrete floor is quite simple. But a good result can only be achieved if all the recommendations are followed. The correct selection of materials, high-quality installation will ensure a long service life of both the system itself and the coating.
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