How far does the filler go?
A good rule of thumb is 1.7 kg per m² and mm of filler thickness. For a Cable Kit for example, you should reckon on filler thickness of 5 mm. That means you will use about 8.5 kg/m².
Do I need to use special filler or fix to install underfloor heating?
No, there is no need to use a special filler. But we do recommend using a fibre-reinforced filler for stability.
How much cable is used on wooden joists?
Cable Kit can be laid in open wooden joisting. To calculate how much cable is needed: (Room area/0.6) x number of lengths per section. Then choose the nearest shorter cable length. In most cases each section is 60 cm. With 4 lengths/60 cm section, the output will be about 75W/m². With 3 lengths/60 cm section, the output will be about 55W/m². Maximum permitted output is 80W/m².Read more about installation in Cable Kit installation instructions.
Should the cable be fitted under or over the mesh?
The cable should always be on top of any mesh.
How far from the wall can I lay the cable (Cableflex/Cable Kit)?
The distance between the wall and the cable should be at least half the c/c-distance.
Is there a risk of moisture rising with underfloor heating?
There is a risk of moisture rising if the concrete slab is poorly insulated. Laying underfloor heating directly onto the concrete floor in an uninsulated cellar is not a good idea, not even if the concrete slab is thick. Old slabs have often been poured onto an uneven surface and can be very thin in places. The heat disappears down into the concrete and your energy consumption increases. When you heat the concrete slab instead of the room, a heat cushion occurs in the ground below the concrete. If the underfloor heating is later turned off, the concrete slab cools faster than the ground. Moisture from the ground can then be transported upwards. This is called reversed moisture flow. You can easily avoid the problem by laying insulation on the existing floor before laying the underfloor heating. A particularly good choice for cellars: Cable Board together with our underfloor heating.
How much Ebeco Foil can be installed on one thermostat?
An EB-Therm thermostat (regardless of model) can handle 30-35 m² of foil. With larger areas, you should connect the thermostat via a contactor.
Can I have underfloor heating under wall to wall carpet?
Yes, you can lay wall to wall carpet on the floor even if you have installed underfloor heating. There is no risk of overheating, because the floor sensor ensures that the temperature does not get too high. On the other hand, it is not particularly energy smart. The carpet stops the heat from rising and there can be a big heat loss down into the ground.
What rules apply to underfloor heating in wet rooms?
For floors in wet rooms, a sealing layer is required. The same is true if you do not install underfloor heating. For more information about floor construction and sealing layers under tiles and natural stone floors – see PER's industry rules issued by the building tile council. There are also advice and recommendations for floor construction and sealing layers at AB Svensk Våtrums-kontroll. This says among other things that the sealing layer must always be above the underfloor heating system.
Why is it not warm in my bathroom in the celler, even though I have underfloor heating and a well-insultated floor?
This is probably due to poorly insulated walls and cold surroundings. This is especially true if you have laid a heated floor in a bathroom or other small room and left the rest of the cellar cold. If walls are poorly insulated, there is a risk that the heat will leak out into the rest of the cellar. This means that it can be hard to raise the temperature inside the small room. This is true for all kinds of heating in cellars, not just underfloor heating. It is quite simply the physical law of temperature distribution that causes heat to move towards cold. This can be avoided by insulating the walls or also heating the rest of the cellar.
Can Adesilex be put onto chipboard?
Mapei's data sheet for Adesilex P4 says "Never use Adesilex P4 on wood or wood composites." Cable Board functions as a motion absorbing layer however. If clinker in P4 is put directly onto chipboard, P4 is not sufficiently elastic to take up the movement in the chipboard and the joints will probably crack. If Cable Board has been laid on the other hand, movement will be absorbed by the insulation board and nothing will happen to the floor.
