BKR ČR, s.r.o. is part of the VELUX group, which has been creating a better life for people all over the world for 80 years and providing them with daylight and air through roof windows. BKR ČR, s.r.o. manufactures and ships shading and electric control accessories for VELUX roof windows.

When it rains, there is leakage through the roof and roof details in many places throughout the warehouse and production part of the hall.

Detailed description: The roof covering is made of modified asphalt strips with slate sprinkle. Skylight structures, lightning rod and ventilation chimneys protrude above the level of the roof covering. The drainage of the roof covering is solved by the falling of rainwater into drainage valleys with a drainage inlet.

Defects: The roof covering showed various types of defects that led to the disruption of the roof covering and to leakage. Places were found in the roof area where the waterproofing modified asphalt strip is significantly cracked, this is caused by the degradation of the strip. This is the so-called CROCKODYLING - loss of SBS modifier and thus the internal elasticity of the strip is reduced. Locally, no places with a wrinkled base or places without protective sprinkle were found. Due to UV degradation, the protective slate covering was released from the ASF strips and subsequently washed into the drainage areas, where the drains were clogged, thereby retaining rainwater and forming lagoons. Leaks in the waterproofing of the asphalt strips were found mainly in the details, namely in the places where the structures were embedded in the substrate (skylights and chimneys). Leaks were also found in the area where individual ASF pairs were connected to each other.

The client contacted us in 2014 with a request for a possible technical solution for repairing the roof of a warehouse hall because the stored goods were deteriorating due to leaks.

The proposed technological repair procedure was a full-surface repair of the roof covering. This involved creating a new waterproofing layer without the need to dismantle the original insulation.

The PLASTONIT technology was used - heavy lamination. This is a three-layer technology, where the first layer is applied with a waterproofing penetration coating PLASTOMIT COMPOSITE SILVER, which was intended to prevent the new release of the slate filling and thus create an adhesive base for the following application. After a technological break, a glass-lamination mat was inserted across the surface and a second waterproofing layer of PLASTONIT COMPOSITE SILVER was applied. It was also necessary to observe a technological break after this application. The final application was made with a reflective coating PLASTONIT SILVER.