GU system threshold flush with floor
Discover the GU system threshold bb from Gretsch-Unitas – an innovative and versatile solution for main entrance, side entrance, and window doors. Ideally suited for timber and PVC systems as well as for single-leaf elements, mullion, meeting stile, and fixed field situations. CE-certified and compatible with various profile systems, the threshold impresses with its thermal break, promoting high energy efficiency and sustainable construction. Continuous sealing levels and the intelligently integrated element drainage reliably protect against water ingress up to 600 Pa, without the need for additional drainage – significantly simplifying planning and construction processes. With tested security up to RC2 and an attractive design, the threshold is ideal for barrier-free doors according to DIN 18040, for example in care homes, hospitals, kindergartens, and private residential buildings.
GU system threshold bb in detail
- The thermal break ensures high energy efficiency and sustainable construction
- With just a few additional components, the GU system threshold (SBS) becomes the flush GU system threshold (SBS bb)
- Continuous sealing levels
- Intelligently integrated element drainage (bfb Product of the Year 2019)
- High resistance to driving rain according to EN 12208 up to class 9A (also for meeting stile doors)
- Burglar resistance up to RC2 in accordance with EN 1627
- Rated sound insulation value according to EN ISO 10140-2 up to 45 dB
(depending on system, glass, and door type)
- Patented locking solution for window doors (bfb Product of the Year 2024)
- Removable drainage profiles for easy cleaning
- Prevention of standing water and moisture through intelligent design
- Clear separation of window construction and building sealing trades simplifies planning and implementation
- Uniform components ensure efficient storage and a harmonious appearance for main entrance, side entrance, and window doors
- Optional: Pre-commissioned or pre-assembled solutions
Top solutions in the field of GU system thresholds
Standards and safety requirements
Our GU system thresholds bb are optimally tailored to the requirements of barrier-free construction according to DIN 18040. They meet the highest standards regarding airtightness, watertightness against driving rain, and wind load resistance, and are tested and certified according to EN 1627–1630 up to resistance class RC2. This ensures maximum protection against burglary attempts. In addition, they offer high sound insulation according to EN ISO 10140-2, which, depending on the system, glass, or profile type, can reach up to 45 dB. In this way, our system thresholds combine functionality, security, and comfort at the highest level.
CE marking
The CE marking is a symbol affixed to a product, indicating its conformity with the essential requirements of the relevant European directives. It shows that the product has been assessed regarding safety, health protection, and environmental protection, and can be freely traded within the European Economic Area (EEA).
Series of standards for burglar-resistant building products
The standards EN 1627 to EN 1630 address burglary resistance of windows, doors and closures. They specify the requirements, classifications and test methods for products intended to protect against burglary attempts.- EN 1627 defines the general requirements and classifications.
- EN 1628 describes the test method for determining resistance under static load.
- EN 1629 covers the test method for determining resistance under dynamic load.
- EN 1630 focuses on the test method for determining resistance against manual burglary attempts.
These standards are crucial for construction products used in security-relevant areas.
air permeability
The EN 12207 standard refers to the classification of air permeability of windows and doors. It defines how much air can pass through a closed window or door under certain conditions. The test is carried out by applying pressure differences across the product to measure its air tightness. These measurements are important for assessing the energy efficiency and comfort in buildings.
driving rain tightness
DIN EN 12208 is a European standard that deals with the classification of watertightness for windows and doors. It specifies how much water can penetrate a closed window or door under certain conditions. The test involves applying water pressure to the external surface of the product to assess its ability to prevent water ingress. This assessment is important for protection against moisture damage and to ensure energy efficiency in buildings.
resistance to wind load
The DIN EN 12210 standard relates to the resistance of windows and doors to wind loads. It specifies how these building components must be tested under various pressure conditions to assess their ability to withstand wind loads. These tests are crucial for ensuring the safety and stability of buildings during strong winds or storms.
barrier-free construction
The DIN 18040 standard deals with the planning principles for barrier-free construction. It is divided into different parts that cover various aspects of construction to enable people with disabilities, elderly persons, and children to participate equally in everyday life. An important aspect of this standard is the easy opening of doors without external assistance. In this context, requirements are placed on door closers, such as limiting the operating forces to ensure that doors are easily accessible.
Kreditanstalt für Wiederaufbau (KfW)
KfW stands for Kreditanstalt für Wiederaufbau, a German development bank. As part of its funding programs, it offers low-interest loans and grants to support measures such as improving energy efficiency or security in buildings. This also includes burglary-resistant measures, which are eligible for funding through products like the Smart Security series from BKS. This KfW funding can be used by both private individuals and commercial projects to facilitate investments in sustainable and secure construction projects.
