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19 Aug 2015

Why do you need to paint your exterior walls?

Painting the exterior walls, why? Painting the exterior walls, why?

Is it only because you want your house to look nice?

Of cause there is more to it, take a look at the image below, an old house where the paint has gone almost totally, but notice that there are also no problems regarding rising damp or plaster falling of the wall, and why is that? – I will get back to that later in this article, so please read on.

Fachada sin pintura

Different building methods around the world

We humans have built houses for many centuries, and each country has their own way of building them. Some countries are ahead with improvements and different building materials, but just because a country is ahead or using other construction materials, it does not mean that their houses are of better quality.

Every year many new materials are introduced to the market, they come from many different countries and as mentioned, each of them has their own construction methods, different climate and etc., which also is reflected in the materials and warranties they provide.

Are you participating in an experiment without knowing it?
You must always remember that when using new materials, you are participating in an experiment, as it is obviously impossible to know how the material will perform in the long term. Therefore, it is always advisable to use materials which are well known and which has a long and good reference list.

There are a lot of good craftsmen who have years of experience and they have also learned from the experience from the older generations too. Important, is that they always practice good building practices, and also familiarize themselves with the supplier's instructions and follow them, otherwise the warranty will void. Here it will be you as a homeowner who stands with an additional cost on the maintenance account if something goes wrong.

Well - back to why you should paint your exterior walls
In the image above, there is no paint on the wall, therefore the wall can breathe. This means that the damp inside the wall can evaporate to the air, which will result in a dry wall. This is ok in a dry and warm summer, but in the winter time with lots of rain it is not good. The wall gets to wet and it loses its insulation capabilities, and it will be almost impossible to heat up the house. Also when the wall is wet, the conditions for algae and moss are optimal, not to mention the problems that will come inside the house as the wall inside also will be wet.
These are some of the reasons why you should paint your exterior walls.

You probably buy paint filled with poison and fungicides to kill the algae’s and moss, also you choose the paint that is not breathable as you believe that the rain will not enter into your walls - maybe not.

Worse problems will come, as the humidity from the inside of the house cannot get out because you have painted with a plastic paint on the outside wall, which makes a moisture barrier.
With time, the paint will crack because moisture from the inside needs to come out, and this will let the rain get in through the cracks and make the problem bigger. All the moist and water accumulates inside the wall and it will build up a pressure that will push off the paint and in the worst cases also the plaster.

Most paints are also static, which means they are attracting dirt and fouling as a magnet, and as you can see in the image below, it is not a very nice wall to look at.

Fachada con puente térmico


Another thing seen in the picture is that, the fouling is most visible on the wall where there are bricks. Where the pillars are fouling is not as bad, this phenomenon is due to thermal bridges. I will, as mentioned further down in this article, cover this in an upcoming article.

So which paint should you use for your exterior walls?

Exterior wall paint solution with some before unseen features.
But do not despair, as there is a solution to the problems, and a solution that is functioning for many years, so you don’t have to paint your exterior walls every other year because of peeling paint, dirt or fouling.

KefaTherm Exterior is a microporous surface treatment that can be applied like paint. It is not static which means that dirt will not be attracted to the surface. Also, it is self-cleaning because of its capillary effect, so if another building part rubs off on the exterior walls, the discoloring will not stick to the exterior walls.

The reason is that when it rains, the KefaTherm absorbs a small quantity of the rain into its micro pore’s, and when it stops raining, KefaTherm evaporates the water out to the air again, and it is in this cycle the exterior walls is cleaned every time it rains. Now you know two of features that KefaTherm has, antistatic and capillary effect, which is keeping your exterior walls clean, so they will look as they were painted yesterday and that for many years ahead.

KefaTherm is an extremely strong and elastic treatment, which does that KefaTherm can cope with movements in the building without cracking. KefaTherm can cover old cracks in the wall, without to crack.

KefaTherm has also fantastic insulation capacities, that protects you building from both heat and cold, we will cover these capacities in depth, in an upcoming post – please submit to our News Mail to get informed as the first.

Constructive protection

  • Good results are obtained by selecting secure materials like masonry and concrete, materials the designers have experience with, and the craftsmen knows.
  • But even well-known materials such as brick and Concrete must be used properly and protected constructively.
  • Exposed brickwork or other types of exterior walls, requires in relation to current standards, to be performed in aggressive environmental class, which is often omitted, and the building owner is left behind with a maintenance-intensive building part.
  • Constructive protection can be anything from roof flashings to extended eaves of the roof.
  • It can also be in the choice of brick and grout design or the surface treatment, as it is important regarding absorption of water into the wall.

Painted exterior walls
Choosing a surface treatment with several properties is important, as it can help to remove moist and reduce maintenance and energy costs. A long lasting self-cleaning coating with insulation capacities and the ability to work together with the other building materials, such as letting the building materials breathe is to prefer. In this way, maintenance and energy cost is reduced dramatically.

kefatherm exterieur

KefaTherm Exterior has all these features and has proven its qualities for over 30 years. Lots of well known companies as Maersk, Carlsberg, Novo Nordisk, Nestlè and many others, has and are still using our products.

  • The constructive protection of houses and buildings must in our opinion be lifted and have more meaning and adapt the buildings to the changing weather and climate conditions.
  • We try to cover important issues regarding damp and humidity in buildings. If you have questions or comments, please do not hesitate to send us a question or a suggestion to an issue to write about.
  • We would also very much like to have comments to our articles, so please post a comment below this article. You are also welcome to post a comment on our Facebook profile.
Read 1742 times Last modified on Thursday, 20 August 2015 15:32

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