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22 Jun 2015

Moisture in the wall - brick absorption

Your bricks are sucking up water - Our paint absorbs the water from your bricks and evaporate it up to 3-4 times faster than normal Your bricks are sucking up water - Our paint absorbs the water from your bricks and evaporate it up to 3-4 times faster than normal

Bricks and moisture

There are many different types of bricks and in relation to moisture they are also different.

The type of clay they are made of has a role and also the way they are burned matters to the strength of bricks. Also the ability to repel cold and heat and not at least the ability to absorb moisture are some of the differences of the bricks.
In addition, there is the design of the bricks which also makes them different, here I am thinking of whether they are solid or hollow.

Here in Spain, the hollow bricks are used a lot since many houses and buildings are built with concrete columns which carry the whole construction, and therefore there is no need for the massive stone that is both stronger and more expensive. The hollow brick is lighter and because it is hollow it is believed that it has better insulation properties, however, one forgets to think about it is not very strong and therefore more porous which means that it absorbs more moisture.

Many of the older houses are built of what was possible to find of common stones and rubble, in fact everything that could be used, has been used to build with, when it came to saving money.

Different wall constructions have different abilities both to transport moisture away by diffusion and to equalize indoor air humidity by moisture absorption.

A brick house releases moisture faster than materials like wood, plaster and concrete. The brick house takes up a volume of water in line with other houses, but the rate of absorption and release of moisture associated with sudden moisture supply to the indoor air is higher in the masonry house, therefore it is a much better building material. (I will in one of the next articles mention more about special multifunction plaster)

Permeable walls - for example, masonry - will be able to absorb and to some extent dissipate moisture and harmful substances through the wall.

Airtight constructions with vapor barrier will require venting to get rid of the moisture, either through open windows or mechanical ventilation - typically in the form of ventilation facilities. This also applies to houses painted with plastic paint, as this acts as a vapor barrier, but unfortunately it's located in the wrong place, since it causes condensation and moisture on the walls inside the house and in the worst case - condensation inside the wall where moisture accumulates and cannot get out, and with subsequent resulting damages on paint and wall.

Bricks are healthier than wood, plaster and concrete

Attention should be paid to the fact that the walls of which among other things, wood, plaster and concrete gets wet, it may take many months or years again to reduce the moisture content to an acceptable level.

Water absorption.

In a study of bricks, it has been found that the bricks with higher capillary resistance figures and a higher density are bricks very compact and which do not absorb moisture from the surroundings to the same extent as other bricks.

In the study, the bricks were wetted and then dried to normal moisture levels.
They also did the same study on bricks treated with lime.

Desiccation was carried out in climatic chambers at 50% RH and a temperature of 20 ° C.

• The untreated brick dried in 170 hours, corresponding to approximately 7 days
• The limed brick dried in 120 hours, corresponding to 5 days

There is thus been shown a difference both in the capillary properties and the drying characteristics of the brick, respectively with and without the limed surface. The brick dry out faster with a limed surface than an untreated surface. It is also established that the limed surface retards the capillary saturation of the bricks. i.e. the brick properties is improved when they are limed.
If you treat the brick walls with plastic paint or other coating that seals the wall, then you destroy the amazing qualities that the brickwall has and which is actually helping to make a house more healthy and nice to live in, and withuot the problems of the moisture, that the plastic paint gives you.

Quita humedades has the paint so your house can breathe, it consists of a micropore system that makes the surface 12,000 times larger and therefore has an evaporation rate that is 3-4 times larger than a regular surface - your walls will therefore remain dry forever. Our paint has better properties than lime and much more.

A bricks water absorption is the water volume, the brick can absorb in two days by standardized testing, expressed in percent of the stone volume. For ordinary brick facade the brick mass water absorption in 2 days in water storage – is in most cases in the range from 20 to 30 percent of the volume.

• For hard burnt brik lower
• For light, porous bricks higher

Clay brick pore system makes that a hard-burnt clay brick faster discharges water through evaporation than any other conventional porous building materials.

The Micropore system in Quita humedades paint means that the bricks can evaporate more moisture to the air, and faster, at the same time it protects against algae, moss and dirt deposits on the facade.

Read more about KefeTherm Exterieur the best exterior facade paint and KefaRid for internal use against condensation and mold, both paints has an outstanding insulating effect.

Read 5374 times Last modified on Tuesday, 23 June 2015 17:14

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