Alenor external window sealing tape with full-surface adhesive
Alenor external window tape is a diffusion-open (vapour-permeable) window installation tape applied on the outside of the installation joint. It protects the installation foam from rain, snow and wind while letting moisture trapped in the foam dry out to the outside. The adhesive covers the full width of the tape, so it fits tightly to both the frame and the edge of the opening.
The tape is based on a synthetic non-woven membrane and a pressure-sensitive adhesive with permanent tack, covered by a release film. It is ready to use without special tools.
Key properties
- Watertightness class W1, watertight at 600 Pa
- Vapour-permeable: Sd 0.81 m (0.92 m after ageing)
- Windproof, adhesive across the full tape width
- Adhesion to steel: at least 12 N/25 mm
- Service temperature: −40 °C to +70 °C
- Application temperature: +5 °C to +40 °C
- UV resistance of the fabric in direct sun: 6 months
- Service life: at least 20 years
- Sizes: width 70, 100 or 150 mm, length 12.5 or 25 m
- Shelf life in original packaging: 12 months
- Suitable for concrete, brick, timber, PVC and passive house construction
Where to use it
- PVC, timber and aluminium window installation – on the outside of the joint.
- Front doors and balcony doors.
- Window replacement where the joint is later covered by façade finish or a sill.
- New and renovated buildings where windows are installed in three layers: external tape – foam – internal tape.
How to apply
- Surfaces must be clean, dry and dust-free.
- Prime porous surfaces with Alenor Super-Fix primer first.
- Stick the tape to the outer edge of the window frame before placing the window in the opening.
- Once the foam has cured and been trimmed, remove the release film and stick the tape to the opening.
- Press the tape along its whole length with a pressure roller, especially in corners.
Why must the external tape be vapour-permeable?
Moisture gets into the joint both from the room and during construction. If there were a vapour barrier on the outside as well, moisture would stay trapped in the foam, the foam would lose its insulating ability and condensation would form around the window. That is why a vapour-permeable tape goes outside and the internal vapour-barrier tape goes inside.
Frequently asked questions
Does the external window tape withstand the sun?
The fabric withstands 6 months of direct sun. That is enough for the installation period, but afterwards the joint must be covered with façade finish or a sill.
Can it be applied in winter?
The recommended application temperature is above +5 °C. In the cold, warm up the tape and the surface temporarily, otherwise the adhesive does not bond fully.
Is the external tape enough on its own?
No. For a long-lasting joint, you need a vapour barrier – the internal window tape – on the inside. The external tape alone does not protect the foam from indoor moisture.
Read more: why external window tape is just as important as the window itself, how to insulate windows with tapes and the window tapes guide. All window installation tapes are in the window tapes category.
Delivery and wholesale
We deliver to DPD, Omniva and Venipak parcel lockers across Latvia in 2–3 working days and to Lithuania and Estonia in 2–5 working days (delivery terms). Construction companies and resellers get wholesale prices – email [email protected] or call +371 28348301.
