Glazing, Door & Window Seals

A window seal is a type of glazing gasket that is fitted into your window frame to create an airtight and watertight seal between the frame and glass. Its primary role is to prevent air and water leakage, whilst also enhancing the energy efficiency and weatherproofing of your windows and doors. These gaskets vary in shape and can be used on uPVC, wooden and Aluminium frames. They are designed for DIY installation and do not require any technical knowledge or support.

Over time your glazing seals may deteriorate and should be replaced to maintain energy efficiency and protection against the elements. uPVC window and door seals are easily replaced and do not require specialist glazing tools or support.

Remove the existing seal from your window frame by locating the end of the gasket and gently pulling it out of the channel. After removing the old rubber seal, check around the window frame and remove any debris or other blockages that may stop you from inserting the replacement gasket. Starting in one corner, insert the new seal into the channel working around the window frame. It may be necessary to make a small V cut in the seal to allow it to bend around sharp corners.

Different types of window gaskets are suitable for different applications. Selecting the correct profile is essential for ensuring a long-lasting watertight sealing solution. Some common types of window gaskets include;

Wedge Gaskets: Often used in double-glazed windows, wedge gaskets are designed to hold the glass in place within the frame. They have a unique shape that, when pressed into the gap between the glass and frame, exerts pressure to keep the glass firmly secured.

Bubble Gaskets: These have a round, bubble-like profile and are used to create a seal that can accommodate slight irregularities in the window frame. They are effective in providing a watertight and airtight seal and are commonly used in UPVC windows.

E Gaskets: Named for their E-like profile, these gaskets are used in various window types to provide a seal that cushions the glass within the frame, helping to absorb shocks and reduce noise.

Flipper Gaskets: These feature a unique 'flipper' or fin-like design that provides an extra barrier to air and water. They are often used in conjunction with wedge gaskets in double glazing systems for enhanced sealing.

Brush Seals: These consist of a strip of bristles or a brush-like material, often used in sliding windows or doors. They allow for smooth operation while providing a barrier to dust and drafts.

Timber Weatherseals: These are made from a combination of polyurethane foam and a polyethylene film, creating a durable and weather-resistant seal. They offer excellent thermal and acoustic insulation and are commonly used in residential and commercial windows.

The average cost of replacing a window seal depends on factors such as the type and size of the window, the type of seal required and the complexity of the sealing profile. However, a standard uPVC window frame with one opening window requires between three to four metres of glazing gasket. At an average price of £3.60 per metre, replacing the seals on one window will cost between £10.80 and £14.40 (excluding VAT).

uPVC window seals are robust, durable and usually long-lasting. However, they can’t last forever and factors such as improper installation, thermal expansion and physical damage may cause the gasket to deteriorate beyond repair. These causes may stretch the section causing it to split or tear. This damages the integrity of the sealing bulb or flipper, resulting in potential issues with air and water ingress.

Weathering, such as temperature changes, harsh weather conditions and UV radiation can also shorten the life of your window seal. Moisture may seep into inflections in the seal or surrounding area, causing spots of weakness that may affect the seals integrity. UV also causes rubber to become brittle, increasing the chance of cracking.

Although these external factors can cause your seal to deteriorate, most window seals fail due to the natural aging of the rubber material. Over time, your seals will lose its elasticity and resilience with no way of rejuvenating or bringing them back to new. Understanding these factors will result in less frequent replacements and allow you to maintain and prolong the life of your existing seals.