Window Tapes: Inner and Outer Window Tape
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How to choose a window tape
The window installation joint is where heat loss and condensation usually begin. Alenor window tapes keep the installation foam dry so it retains its insulating properties for the full service life of the building.
The inner window tape is a vapour barrier tape for windows — it stops indoor moisture entering the installation joint. The outer window tape is vapour permeable: it protects the joint from rain and wind while letting trapped moisture dry outwards. Both have full-width adhesive coverage, so the window sealing tape sits without bubbles even on uneven surfaces.
- Inside — vapour barrier window insulation tape
- Outside — vapour permeable outer window tape
For a lasting bond, prime the surface with Alenor Super-Fix first — especially on concrete, brick or porous substrates.
Useful articles about window mounting tapes
Frequently Asked Questions
How do I choose the right window tape for my wall material (concrete, wood, PVC)?
Alenor window tapes bond reliably to concrete, wood, and PVC frames alike, as long as the surface is clean, dry, and dust-free before installation. Use the inner tape as a vapor barrier on the room side, and the outer tape for weatherproof sealing on the exterior.
What's the difference between the inner and outer window tape?
The inner tape acts as a vapor barrier, stopping moisture from the room reaching the window gap, while the outer tape is vapor-permeable but waterproof — it lets moisture escape from the structure while keeping out rain and wind.
Can window tape be installed in winter or cold weather?
The recommended installation temperature is above +5°C — below that, the adhesive won't bond properly. If work must be done in winter, warm both the tape and the surface beforehand.
How long do Alenor window tapes last?
Properly installed window tapes retain their properties for many years (the manufacturer specifies at least 10 years for the internal and at least 20 years for the external tape), since they don't crack or lose flexibility the way traditional foam sealing does.
