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06 Oct 2015

Insulating paint - how does it work?

Insulation paint Kefatherm Exterior will keep your walls dry Insulation paint Kefatherm Exterior will keep your walls dry

Insulating paint, does it work and how?

The Kefa system is breathable coatings/paint that are water-based and are made out of acrylic and crushed volcanic stones, which together form a surface with millions of micro pores, which contains air.
The amount of the micro pores, together with the crushed volcanic stones, is what makes our coatings so special. The Kefa products has some of the very best features on the market, when talking moisture and condensation solution, insulation solution contra heat, cold and sound, and not at least the only long lasting and 100% working solution against mold and bacteria.

Characteristics of the Kefa coatings:






The Kefa system provides a material structure with some very unique physical properties which make it ideal as insulation material. The Kefa solution works as insulation against the cold in winter, against the heat in the summer and on top of that, it also has very good soundproofing capabilities.

All the materials we use in the construction have insulation capabilities - some better than others. To find out which materials are the best to use as insulation material, we need to know more about heat conductivity.

Remember - the direction of the heat transfer will always be from a higher temperature to a lower temperature.
It is therefore not possible to lead the cold in, but heat can be led out!

Here an illustrative example of heat conduction:
If you put one end of an iron rod into a campfire, keeping the other end of the iron rod in your hand, it does not take long before you will feel "the heat of the fire" in your hand, even if the iron rod is both 2 and 3 meters long.
Gases like air and liquids like water has as solids a specific thermal conductivity. However, since molecular density is smaller in gases than in solids, the thermal conductivity is also less.
So stagnant air is one of the best insulating materials we have.

Here is a list of the most known materials and their insulation capabilities, please be aware that it is the materials with the smallest number that has the best insulation capabilities!

In the list you can see that the best material for thermal insulation is air, therefore we are interested in using it for insulation. As told Kefa coating is made out of micro pores which contain air, that’s why it has such good insulation capabilities.

There are other thermal paint products, but these should be used with care if used on walls, as you will seal of the walls so they cannot breathe, also they will not protect you effectively against condensation and mold.
For most paints that call themselves vapor permeable - including lime, it applies that if applying more layers, then they will all lose breathability, also the age of the paint will decrease the breathability.
Lime is one of the best products to use for your facade so it can breathe, but KefaTherm has even better properties than lime, when talking about vapor permeability, and you can apply as many layers you want without damaging the vapor permeability, it just insulate better and keeps your walls dry and free from mold etc. Read more about breathable paint and why you should use it in one of our next articles. Remember to subscribe to our newsletter and get the latest news first.

Energy savings
Because of the insulation capabilities of the Kefa products, you will be able to have energy savings up to 40%. This applies for both heat and cold, reducing consumption for heating and air conditioning.
The Kefa products improve insulation indoors and outdoors, avoiding interior condensation, mold and significantly reduce the noise level.

Thermal bridges
In the below images you see a facade with algae, and a thermographic photo showing the differences in temperatures on the surface of the same facade.

In the thermographic image of the facade, you can see the characteristic thermal bridging, wherein the supporting structure has a different temperature than the rest of the structure.
Here the supporting structure part of the facade is warmer than the other part of the facade.

Algae, lichens etc.
In the northern regions/countries, we see discoloration/algae are reversed, so it’s colder where the supporting structure is – that’s because it can be up to 40 degrees in difference between the inside and the outside temperatures in the northern regions during the wintertime.

What happens is, where the wall is colder, the air condenses, providing a breeding ground for algae, lichens, etc. The algae are coming through the air in the form of particles from vegetation, such as trees, plants etc.
When the dew falls in the earlier morning hours, then the grass, the roofs and the facades etc. are moist. When the surface is moist, the particles become trapped on the moist surface and goes back into growth when the moisture is prolonged.

These problems with thermal bridging can be solved with an external insulation. KefaTherm Exterior can solve this problem in southern Spain and in areas with more cold we recommend to use Kefa DrainPutz together with the KefaTherm Exterior, a mortar with very good anti moist and insulation capabilities.
KefaTherm together with Kefa DrainPutz is a good option compared to a SATE or ventilated facade, since it is also a continuous insulation in contrast to an internal solution which will not insulate columns and beams. Also internal insulation is often followed by humidity and mold problems.

KefaTherm is also known as a surface treatment that will last in many years without any maintenance.
Here are some examples of the insulation capability of the Kefa System, also remember that there is no other material that has the capabilities regarding moving moisture out of the wall as the Kefa system, it is simple physics and it works for ever.

By applying Drainputz and KefaTherm to the exterior wall you can lower the U-value by around 40%, which fits very well with one experiment we made with a metal roof on a store building, with an outside temperature of 34 degrees, where the inside temperature were lowered from 58 degrees to 32 degrees – almost 45% lower only by applying 1,2 mm of KefaTherm on the inside of the metal roof.

Click on the images to enlarge.

 Massive wall without insulation  Massive wall with Kefa Drainputz mortar and KefaTherm coating
 Massive wall without insulation  Massive wall with Kefa Drainputz mortar and KefaTherm coating


Please be aware that the calculations above are when the walls are dry.

Wet Walls Transfer Heat Twice As Fast As Dry
It is proven that wet walls transfer heat twice as fast as dry walls. If the walls are wet, the more energy has to be used to obtain an ambient room temperature.

Do you experience dificulty heating up your house in wintertime? - maybe your walls are wet and are transfering all the heat to the outside, and you are spending your money twice as fast too.

Stop your heat transfering, use the Kefa system on your walls it will keep them dry.

Lowering the moist in the walls by 4% will increase the natural insulation capability of the walls by 50%, so start drying out your walls today with KefaTherm Exterior and save energy.

Read 6615 times Last modified on Wednesday, 07 October 2015 23:07

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