Installation material for safe and standard-compliant window and door installation

The GU window sealing tape Vario is UV- and weather-resistant for 12 months.

Yes, the GU window sealing tape Vario can be plastered over with mineral mortars.

The sd-value* of the GU window sealing tape Vario ranges from 0.3 to 30 m, depending on ambient humidity and temperature.

*The sd-value describes water vapor permeability and is composed of the material-specific value (μ-value) and the material thickness in meters.

In addition to the previously known sd-limits of 0.5 m and 1500 m, further limits and terms have been introduced. However, this more detailed differentiation is not relevant for the assessment of water vapor permeability of sealing systems for connection joints.

Definition of sd-values for component layers according to DIN 4108-3:2018-10:

• Vapor-permeable (sd ≤ 0.5 m)
• Vapor-retarding (sd ≥ 0.5 m – sd ≤ 10 m)
• Vapor-inhibiting (sd ≥ 10 m – sd ≤ 100 m)
• Vapor-blocking (sd ≥ 100 m – sd ≤ 1500 m)
• Vapor-tight (sd ≥ 1500 m) 

Yes, the GU window sealing tape Vario is vapor-permeable, as its water vapor permeability flexibly adapts to the respective ambient humidity and temperature, achieving values between 0.3 m and 30 m.

The GU window sealing tape Vario is generally not suitable for ground-contacting building waterproofing according to DIN 18533. Materials such as liquid plastics, EPDM membranes, or cold bitumen (KSK membranes) are usually used for this purpose.

Sealing tapes of stress group MF1 according to DIN 18542 are suitable for directly exposed joints, i.e., unprotected outdoor use. They are resistant to driving rain up to a differential pressure of 600 Pa.

Sealing tapes of stress group MF2 are also suitable for outdoor use but must not be exposed to permanent, direct weathering. They are resistant to driving rain up to a differential pressure of 300 Pa.

Sealing tapes of stress group BGR are specifically intended for the room side and seal the joint airtight. They are thus GEG-compliant.

UV stability is regulated by the stress groups according to DIN 18542. Tapes of stress group MF1 are permanently weather-resistant and UV-stable, tapes of stress group MF2 must be structurally covered.

Yes, if the application area or the connection joint width is greater than the application range of the GU multifunctional sealing tape, two sealing tapes can be bonded on top of each other. A maximum of two sealing tapes of the same dimension may be doubled. Functionality is maintained as long as the compression ratio in relation to the connection joint width is still observed. However, please note that uneven expansion may cause the middle layer to shift.

When doubling, the self-adhesive side of the upper sealing tape must be bonded to the foam surface of the lower sealing tape. It is important that the sealing tapes are bonded precisely and carefully to effectively double the dimensional range.

Small gaps or interruptions at window corners, tape joints, load transfer blocks, and fastenings can be professionally sealed afterwards with GU Ultra sealant. This reliably restores the sealing.

Yes, the GU multifunctional tape meets the requirements for vapor-permeable sealing according to the RAL principle "tighter on the inside than on the outside." This ensures safe drying of the connection joint. Please make sure to orient the printed or color-marked side of the sealing tape to the inside.

Joint sealing tapes of stress group BG1 according to DIN 18542 are suitable for directly exposed joints, i.e., unprotected outdoor use. They are resistant to driving rain up to a differential pressure of 600 Pa.

Joint sealing tapes of stress group BG2 are also suitable for outdoor use but must not be exposed to permanent, direct weathering. They are resistant to driving rain up to a differential pressure of 300 Pa.

UV stability is regulated by the stress groups according to DIN 18542. Tapes of stress group BG1 are permanently weather-resistant and UV-stable, tapes of stress group BG2 must be structurally covered.

No, doubling the GU joint sealing tape is not possible. Resistance to driving rain and wind can only be ensured if the compression ratio is maintained at 1:1 in relation to the connection joint width and joint depth of the sealing tape.

Small gaps or interruptions at window corners, tape joints, and fastenings can be professionally sealed afterwards with GU Ultra sealant. This reliably restores the sealing.

For fastening and load transfer of windows and external doors, installation must be carried out on at least two opposite sides per element in accordance with the generally accepted rules of window installation, without special additional requirements. The execution and dimensioning of the fastening is based on the installation plan or workshop drawing of the responsible installation manager.

The material-specific values of the frame and wall materials, the load transfer, the fastening means used, and the usual loads must be taken into account. Structural verification for the fastening and the use of fastening means with building authority approval (abZ) are generally not required if the recognized rules of technology are observed.

For installations that pose a risk to life and limb or for elements with fall protection, the building regulations must be observed. In such cases, structural calculation or a usability certificate for the entire element installation by a structural engineer is mandatory.