This blog post is all about the gaskets that are used with double glazed windows. The gasket lines the window frame itself, with one on the sash of the window and another on the outer frame. When the window is closed, the two gaskets form a tight water seal to keep out the rain, as well as wind and drafts. A gasket is also used between the window panes and the UPVC frame to provide a waterproof and air-tight seal around the glass.

Types of window gasket

Window gaskets are generally available in two types: bubble or flipper. The bubble gasket has a taper that is used to insert it into the window sash, outer frames and also against the glass. The bubble part is flexible and when pushed against another bubble gasket or the window pane, it forms a seal.

Flipper gaskets are also attached to the sash and outer frame but have a flap or ‘flipper’ edge. When the window is closed, the flipper is pushed into position to form a seal that is both waterproof and windproof.

The gaskets are often sold in twenty meter lengths and a gasket cutter is used to cut them to size. They are made from materials such as neoprene rubber due to their ability to return to shape and their longevity.

The advantages of window gaskets

The window gaskets provide several benefits which contribute towards double glazing’s popularity over the past few decades. Firstly, the gaskets help to keep warm air in, giving better insulation, fewer drafts and lower heating bills. Secondly, outside noise is reduced, which is highly desirable if you live on a busy road or you are close to a railway line. Thirdly, the seal keeps out rain, wind and the elements, plus condensation that can lead to damp on the walls and window sills.