Glazing blocks

Order Glazing Blocks

Glazing blocks are necessary to ensure that your glass is not placed directly on the window frame, but that a space is left between the glass and the frame. This allows the frame to ventilate and moisture to drain. When you do not use glazing blocks, the pane will sit in the moisture, which can cause the sealant edge of your double glazing to come loose and your windows to leak. Leaky windows can be recognized because condensation can get between the two panes of the glass.

It is important to choose the correct type of glazing block, to place the glazing blocks correctly and to choose the correct width. The glazing blocks on this page are flat so you can only use them if the bottom of the frame is also flat. If the frame part into which the glass is to come is sloping then you will have to opt for wedge or wedge blocks. These are slanted, which makes it better in that situation.


Tips and advice for the straight glazing blocks on this page:

  • You place the glazing blocks at least 5 cm from the corners, but never further from the corner than 1/4 of the width of the pane. This also applies if you have to place glazing blocks on the side or top of the window
  • The exact placement of the glazing blocks depends on the situation: for rotating parts, for example, you place the blocks differently than with a fixed part. Be well informed in advance about this
  • Use glazing blocks that are at least 2 mm wider than the thickness of your window glass
  • The thickness of the blocks is equal to the circumference of the glass pane
  • See the NPR3577 for placement guidelines to comply with NEN3576

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