0800 - 112 112 9
Exterior Sealing



If moisture enters the basement through the walls, typical
mechanisms of deterioration set in. The degree of damage
depends on how long the walls have been exposed to
moisture as well as on the type of water exposure.
Our ISOTEC Exterior Sealing provides secure protection
from lateral moisture penetration.

Exterior sealing with ISOTEC

Our approach:

The problem:Lateral moisture penetration

If the exterior sealing is damaged or even lacking, moisture penetrates the masonry through the area that is in direct contact with the ground. Posible damages may include staining, chipping of paint and plaster, mould infestation and even flooding in the basement.

Our 1st step: Preparation/Plastering

We expose and clean the masonry which needs to be sealed. The junction between the masonry and foundation ledge is rounded out with a concave moulding. We then apply our ISOTEC Sealing Plaster. The plaster ensures ideal adhesion and an even spreading of the following sealing layer.

Our 2nd step: Sealing

We add a textile insert to the first layer of the bitumen and plastic emulsion (ISOTEC-VAS). We then apply another layer of the ISOTEC-VAS sealing. This way we obtain a sealing layer of at least 4 mm in depth.

Our 3rd step: Insulation/Protection

After the ISOTEC-VAS has dried completely, we apply special thermal insulation panels. These panels protect the insulation from damage when the ground is filled back in. In addition, they considerably improve the thermal insulation coefficient and thereby the energy balance of the building.

Officially approved - scientifically confirmed

At ISOTEC we only apply systems that comply with the strictest regulations. The ISOTEC Exterior Sealing is executed in compliance with the regulations of the WTA (German scientific-technical consortium for the preservation of buildings and monuments). Our ISOTEC Exterior Sealing also complies with all requirements of the Material Testing Office of North Rhine-Westphalia.

Your benefits at a glance

  • Environmentally-friendly and solvent-free

  • Better health, more safety

  • Successful sanitation guaranteed - permanent protection

  • The pleasant indoor climate after sanitation permits healthy and comfortable living

  • Improvement of heat insulation

  • Increase in property value

Exterior Sealing: Our satisfied customers

Hauptbahnhof, Mainz | Damage: Lateral moisture penetration

The ISOTEC Group has successfully sealed more than 100.000 properties in Germany, Austria and Switzerland in the last 25 years.

Amongst others, the ISOTEC Group also renovated the central station of Mainz, which is one of the most important railway junctions of the western Frankfurt Rhine-Main area. In addition to the ISOTEC Horizontal Barrier, the ISOTEC External Sealing was applied to the masonry at four metres of depth. Those measures have resulted in dry walls and the conservation of a beautiful and historic building.

[Translate to Englisch:] Sanierung des Mainzer Hauptbahnhofs durch ISOTEC Außenabdichtung

Download area external sealing

You can download more information here: