All humidity comes from below
With a professional base seal, the vast majority of structural damage can be prevented. Because the causes of damp walls are mostly in the ground.
The "foot" of the facade is the Achilles tendon of the house. If the base area is not expertly sealed, splash water and harmful salts penetrate into the masonry via the capillary suction. And long before the quality of living is impaired, externally visible damage occurs. Splashing water and salts have different freezing points. The consequences? In long periods of frost, the plasters do not withstand the pressure of the frozen and crumble away. From unpainted natural stones and bricks, complete, lintel-like areas are bursting.
Every client should have the works and materials for a professional base seal in the contract signed and guaranteed. If it is necessary to renovate, the child has fallen into the well and the construction effort is greater. What should I do? First, the causes must be combated and then the damage repaired. Say, the artisan explores the source of moisture, then permanently suppresses moisture ingress.
Salts and water spray damage the house
The pollution of the soil with harmful salts such as chloride, nitrate or sulfate can be assessed according to established standards , The more intensive the load, the more time-consuming it will be to apply the restoration plaster layers. After the soil test, the builder takes the trowel: he removes mortar residues, mud and paint. He scrapes the masonry joints affected by the damage with salt about 20 centimeters deep.
Afterwards, the base must be sealed at least 30 centimeters above the ground. It is important to create a gapless transition to the so-called earth-touched, ie in the soil structural seal. A 10-centimeter-wide overlap should be made between the base seal and the area under the ground edge. Laterally installed horizontal barriers in the cross-section of the masonry protect against capillary moisture ingress.
Standards apply to base seals
For plaster facades, it is advisable to apply mineral sealing sludge above the ground. Plastic-modified bitumen waterproofing is often used for earth-contacting seals. Brick facades and other exposed masonry is not covered with plaster. Here the classic sealing system is suitable only in the earth area. Above, an invisible, water-repellent impregnation can be applied.
Fortunately, the client does not depend on arbitrary action by the specialist. He can also secure himself here by standards. In 2012, the research company Landschaftsentwicklung Landschaftsbau e.V. (FLL) published its "Recommendations for the planning, construction and maintenance of transitional areas from open spaces to buildings" for the first time. A tail unit for safe and solid base waterproofing.