01Clean window frames
First, you should clean your window frame. For lighter dirt, water and dish soap are sufficient. For stubborn dirt, you can use special frame cleaners.
Sealing and insulating windows
Leaky windows can make your home feel cold and uncomfortable—especially in winter. With window seals and insulation film, you can easily seal and insulate your windows. This helps protect your living space from drafts and external influences, improving indoor comfort and shielding your home from potential damage.
Window seals and window insulation film in brand quality
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Sealing windows – for a pleasant indoor climate and reliable protection against the cold
The temperature in your home depends largely on how well the window frames are sealed. If they are not properly sealed, cold air enters the rooms—and warm air escapes. Even small cracks or gaps can cause noticeable drafts. The result: the room remains unpleasantly cool despite the heating running, and the temperature can hardly be kept stable.
Such leaks around window frames occur particularly often in old buildings or older properties. Many of these windows are made of wood, which expands and contracts over the course of the year. This creates fine gaps that make new sealing necessary.
With our tesa® window seals, you can fix these weak spots quickly and easily—without any tools. Whether plastic or wooden windows, new or old: We offer various sealing profiles for different gap widths, so you can always find the right solution.
Your benefits at a glance
- Stop drafts – for noticeably more comfort
- Keep the cold outside – for a stable indoor climate
- Retain heat in the room – for consistent temperatures
- Stabilize temperature – for fewer fluctuations in everyday life
- Increase living comfort – for a more comfortable atmosphere in every room
Use our digital configurator to find the ideal window seal for your home—tailored to the type of window and the gap size. This way, you can ensure greater comfort and protection from the cold in just a few simple steps.
How to spot leaky windows – a simple draft test
If your rooms stay cool despite the heating being on, it’s often due to leaky windows. Even the smallest cracks in the window frame can be enough to let cold air in and allow warm air to escape. The result: noticeable drafts and an unstable indoor climate.
With a simple trick, you can quickly and reliably detect leaks:
- Close all windows and doors
- Light a candle or lighter
- Slowly move the flame along the window frames
If the flame starts to flicker, this indicates a leak. You can then seal it specifically with a suitable window seal—quickly, easily, and without tools.
Find the right window seal – the right solution for every window
Windows are as individual as the buildings they are installed in. That’s why we offer a wide range of window seals that can be flexibly adapted to different frame types and gap sizes. This way, you can stop drafts, stabilize the temperature, and increase living comfort – all without any structural measures.
Our seals differ mainly in two respects:
- Material: Depending on your requirements, you can choose between rubber, silicone, or foam seals.
- Joint width: For fine cracks from 1–3,5 mm up to larger joints up to 7 mm, you’ll find the right solution with us.
Our sealing variants at a glance
- tesa® INSULATION Weatherstrip Premium
A premium silicone weatherstrip that adapts to a wide range of gap sizes. It seals gaps from 1–7 mm and provides reliable protection against drafts for up to 15 years. - tesa® INSULATION Weatherstrip PE-Foam
A practical PE foam weatherstrip for smaller gaps between 1–3.5 mm. Ideal for quick and easy sealing of windows and doors. Formerly: tesamoll® STANDARD I-Profile. - tesa® INSULATION Weatherstrip Rubber E-Profile
E-shaped rubber weatherstrip for small, localized leaks. Flexible, durable and suitable for gaps from 1–3,5mm. Formerly: tesamoll® E-Profile rubber seal. - tesa® INSULATION Weatherstrip Rubber P-Profile
A P-shaped rubber weatherstrip for uneven gaps between 2–5 mm. Provides durable and reliable insulation for improved comfort. Formerly: tesamoll® P-Profile rubber seal. - tesa® INSULATION Weatherstrip Rubber D-Profile
A D-shaped rubber seal for larger gaps of 3–7 mm. Ideal when maximum gap coverage and effective draft protection are required. Formerly: tesamoll® D-Profile rubber seal.
All seals are self-adhesive, can be cut to size individually, and are also suitable for doors. Depending on the model, various colors and sizes are available – for optimal adaptation to your home.
Seal windows quickly and easily
With our tesa® window seals, you can seal your windows in just a few steps – without any tools or prior DIY experience. The sealing tapes are self-adhesive and can be applied directly to the leaky spot on the window frame. This way, you can stop drafts in no time and ensure a pleasant indoor climate.
The simple application saves time and effort: cut the seal to size, stick it on, done. Cold air stays outside, the warmth stays in the room – and your living comfort noticeably increases.
Seal the windows in just 3 steps
02Remove old seals
No window seals may be glued over existing seals. Therefore, you now need to remove the old seals. This works perfectly with a putty knife.
03Glue on new seals
Thanks to the self-adhesive side of our window seals, all you need to do now is stick on the sealing strips and press them down. That’s how quickly a window can be sealed.
Sealed windows for many years
Leaky windows are a nuisance and, in the worst case, can ruin the household budget. All the more important that the new seals last for a long time. Thanks to high-quality tesa® adhesive technology, you will find the minimum durability specified on our window seals. In general, our window seals last for 4 to 8 years. With our tesamoll® Premium Flexible, you have protection against leaky windows for at least 15 years.
The most important benefits of sealed windows
Sealing your windows offers several benefits – for your home, your well-being, and your environment:
- Retain warmth indoors & prevent mold growth
A consistent indoor temperature not only ensures greater comfort, but also protects against moisture and potential mold growth—especially in the colder months. - Stop drafts & stabilize temperature
By sealing window frames, cold air stays outside. The indoor climate becomes noticeably more comfortable, and the temperature remains constant – without having to keep reheating constantly. - Improve noise and dust protection
High-quality window seals not only reduce drafts, but also disruptive outside noise and the ingress of dust. This makes your home quieter and cleaner.
Questions & Answers on the topic of “Sealing windows”
How do I repair a window seal?
You can easily replace a window seal. You should not cover existing window seals. Instead, you can remove the old seals and simply stick on our self-adhesive seals.
Condensation on the window - what to do?
Condensation on the window is a warning for mold. The most common reason for condensation on the window is leaks in the window frame. In such cases, you should seal your windows as soon as possible.
Who has to pay for window maintenance?
Basically, the owner or the homeowners' association is responsible for the windows. If you are a tenant, you should consult your landlord. In any case, it is important to act quickly with leaking windows. Every day without tight windows increases heating costs and the risk of mold.
When should I seal windows?
If temperatures remain consistently low despite the heating being on or if there is a draft, you should seal the windows as soon as possible. Condensation on the window can be another indication of leaky windows.
How to seal windows?
You can quickly and easily stick on our window seals. The self-adhesive side of the sealing tapes ensures perfectly sealed windows reliably and long-term in no time.
Last updated on Sep 24, 2026