Wedge gaskets are commonly found in double glazed units on residential and commercial buildings. They can also be used in Aluminium window frames on boats where it is not possible to use a square U channel due to tight bend radiuses. They are designed to be inserted between the glass and frame to apply compression against the glass and hold the window firmly in place.
This guide from Seals Direct demonstrates what measurements you need to take before purchasing a replacement product.
Video Demonstration
Whilst identifying and sourcing a wedge gasket is a relatively simple process, the difference between the products in our range is as small as 1mm. Failure to accurately measure the gap in your channel could result in you ordering a replacement item that is too big to fit into your channel, or too small and does not apply enough compression against the window pane.
This video demonstration from Seals Direct shows how to measure the gap between your frame and glass panel. We also discuss several misconceptions that will ensure you minimise the chance of taking an incorrect measurement.
Measure the Gap for Wedge Gaskets Using a Ruler
There are several different ways of taking this measurement. The first option is to remove the existing wedge gasket from one side of the window frame. Using a ruler you can then measure the gap between the glass and frame. Whilst this is normally very accurate, you should ensure that your ruler does not have space before the start of the first measurement, as this will give you an inaccurate reading.
When measuring the gap using this method, we recommend that you only remove a small part of existing wedge gasket from one side of the window pane. This will reduce the change of the glazing gasket on the opposite side pushing the glass and reducing the size of the gap you are trying to measure.
Measure the Gap for Wedge Gaskets by Removing the Window
If you are able to disassemble your window frame, you may find it easier to measure the internal width of the channel and thickness of the glass. Once you have these to measurements, you can calculate the size of the gap either side of the glass. For example, if the internal width of your channel measures 10mm and the thickness of your glass is 4mm there is a 3mm gap either side of the glass.
This method may be difficult for large uPVC windows, but is often the preferred way of identifying a replacement wedge gasket on Aluminium window frames on boats and some older caravans.
Order a Replacement Wedge Gasket
We offer eight standard sizes of wedge gaskets which should fit the majority of window frames. All of these seals can be purchased by the metre from our Wedge Gasket product category.
Depending on the size of the channel and thickness of your glass, you may only have space for one wedge gasket on one side of the window. The other side of the glass can be cushioned against the side of the frame using a piece of sponge expanded neoprene.
Once you have purchased a replacement wedge gasket, fitting the seal into your frame is a relatively easy process. Remove the existing seal and simply push the new gasket into the gap either side of the window using your fingers. If you are refurbishing the entire aluminium window frame, we recommend resting the glass on a piece of expanded neoprene. This process is detailed in our ‘Replacing Seals in Fixed Aluminium Frames’ guide.