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01Clean the window frame
First, clean your window frame. For light dirt, warm water with a little washing‑up liquid will do. For stubborn marks, use a specialist frame cleaner.
Window Insulation
Leaky windows can leave your home feeling cold and uncomfortable, particularly during the winter months. By using window seals and insulation film, you can quickly and easily seal and insulate your windows. This helps block out draughts and external elements, boosts indoor comfort, and protects your home from potential damage.
How to Spot Draughty or Leaky Windows
If your room feels cold even with the heating on, leaky windows are often to blame. The next step is to locate the draughty areas, which are usually tiny cracks just a few millimetres wide and easy to miss. Here’s a simple way to find them:
Close all windows and doors, then light a candle or use a lighter. Slowly move the flame along the edges of the window frames and watch for any flickering. If the flame wavers, you’ve found a draughty spot.
Once you’ve identified the leaks, you can easily seal your windows to keep your home warm and energy efficient.
How to Choose the Right Window Seal for Every Window
Because there are so many types of windows, we offer a wide range of window seals to ensure you always find the perfect fit.
Our seals differ in two main ways: material and size. You can choose from rubber, silicone, or foam seals, each designed for different needs. It’s also important to match the seal to the size of the gap—our range includes options for small gaps (1–3.5 mm) as well as seals for larger draughts up to 7 mm. This way, you can easily find the right solution for every window in your home.
Choosing the Right Window Seal:
- The All-Rounder – tesamoll® Premium Flexible:
Our universal window seal is designed to fit nearly every window and draughty spot. Suitable for gaps between 1–7 mm, this durable seal lasts up to 15 years. - Foam Seal – tesamoll® STANDARD I-Profile:
Easily seal your windows with this foam I-profile seal, ideal for gaps from 1–3.5 mm wide. - For Small Gaps – tesamoll® E-Profile Rubber Seal:
If you only have minor draughts, our E-profile rubber seal is the perfect choice. It effectively seals small gaps between 1–3.5 mm. - For Larger Gaps – tesamoll® P-Profile Rubber Seal:
For bigger draughts, the P-profile rubber seal is ideal. It fits gaps from 2–5 mm and is quick and simple to install.
You can use our seals not only for windows but also for doors. Thanks to their self-adhesive backing, installation is quick and easy. Many of our window seals come in different colours and sizes, and you can also cut the sealing tapes to fit your needs.
There are other ways to seal windows, such as using acrylic or silicone. For this, you’ll need to remove the old sealant with a scraper, clean the gaps thoroughly, and then apply new sealant with a cartridge gun. Smooth the joint with a damp cloth or joint smoother, attach the new seal with foil, and close the window. After about two hours, the seal will be dry and you can remove the foil. However, this method is much more complicated than using our sealing tapes. If you want a quick and easy solution, tesa® window seals are ideal—even if you have little DIY experience.
Seal Windows Quickly and Easily
You can install our window seals in no time. With just a few simple steps, your windows will be draught-free. Most of our seals are self-adhesive—just peel and stick the tape to the gap for instant results.
Seal Windows in Just 3 Simple Steps
02Remove the old seals
Never stick new window seals over existing ones. So, remove the old seals now. A plastic scraper or spatula works perfectly for this DIY draught‑proofing step.
03Install new draught‑proofing seals
Thanks to the self‑adhesive backing on our window seals, simply stick and press the sealing tape into place. That’s how quickly you can draught‑proof a window.
Windows sealed for years to come
Leaky windows are frustrating and can drive up energy bills. That’s why long‑lasting seals are essential. With high‑quality tesa® adhesive technology, each window seal shows its minimum durability. Most tesa window seals last 4–8 years, while Premium Flexible protects against draughts for at least 15 years.
The main benefits of sealing your windows:
- Retain Warmth & Prevent Mould: A steady room temperature boosts comfort and helps prevent moisture build‑up and potential mould—especially in colder months.
- Stop Draughts & Stabilise Temperature: Seal window frames so cold air stays out. Your indoor climate feels noticeably more comfortable, with stable temperatures—without constant heating.
- Improve Noise & Dust Protection: High‑quality window seals cut draughts while reducing outside noise and dust, making your home quieter and cleaner.
Questions & Answers about sealing windows
How do I repair a window seal?
Replacing a window seal is quick and easy. Don’t cover worn seals; remove them first. Then simply apply our self‑adhesive window seals for reliable draught‑proofing and weather protection.
Condensation on windows – what should you do?
Condensation on windows is a warning sign for mould and damp. The most common cause is leaks or gaps in the window frame letting in cold air and moisture. In this case, seal your windows promptly with quality draught‑proofing and weatherproof window seals to prevent mould growth and improve energy efficiency.
Who pays for window maintenance?
In most cases, the homeowner or the freeholder/management company is responsible for window maintenance. If you’re a tenant, speak to your landlord. Act quickly with leaking or draughty windows—every day without properly sealed windows raises heating bills and increases the risk of damp and mould.
When should I seal my windows?
If rooms stay cold even with the heating on, or you feel a draught, seal your windows as soon as possible. Condensation on the glass is another sign of leaky windows—add draught‑proof window seals to improve energy efficiency and prevent mould.
Why should I seal my windows?
Leaky windows push up energy bills and increase the risk of mould. A high‑quality, intact window seal keeps your home warmer and helps cut heating costs. Plus, many seals also offer extra protection against noise and dust.
How do I seal my windows?
You can quickly and easily apply our self‑adhesive window seals. The strong adhesive backing on the sealing strips creates a reliable, long‑lasting, draught‑proof seal in minutes—ideal for DIY weatherproofing and improved energy efficiency.
Many windows let cold draughts in
If you’d like to save on energy and heating costs, you should take a closer look at your roof, walls, doors, radiators and windows. While there’s often some room for improvement in roofs and walls with regard to heat insulation, doors and windows also create high energy losses that can often be avoided with several insulation solutions. Sometimes draughts that get through gaps and cracks in windows and door frames are the reasons for wasted energy. Other times, the window panes are at fault for poor energy ratings. But we’ve also got a solution for that problem. Cold protection film enables you to quickly insulate your window panes. All products have a long lifespan and can be mounted comfortably. Insulating windows really is quick and simple with the tesamoll® draught excluder range.
