Buying window seals for my UPVC windows?

Buying window seals, but which seal fits my UPVC windows?

Basically, there are different window systems from manufacturers with different seals. They often differ only in the shape of the gasket. Identifying the right gaskets requires experience. This is where we come into play and are happy to assist you.
Please note: The following is exclusively about the determination of gaskets for PVC-U and aluminum windows and doors. The topic of gaskets for wooden windows is dealt with below.
The most important factor in determining the correct gasket for your window or door is the gasket base. This is pressed into the gasket holder (groove width on the window in mm) of the window. The gasket base describes the lower part of the gasket and often has the shape of an arrow => and then ends at the gasket body.
Whether a gasket fits depends on the gasket base. A distinction is made here:
  • The web width (narrow part of the gasket base) is the clamping area of the gasket. To do this, you must measure the exact width of the groove on your window. If the groove on your window is 3 mm, for example, the web width on the new seal should be approx. 2.8 - 3.3 mm. Slightly smaller is not so tragic, then the seal will fit more easily into the existing groove.
  • The gasket base (the triangle of the arrow) should then be about 3.5 - 4 mm. The gasket base secures the gasket in the groove of the window. At the same time, it prevents the seal from coming loose from the seal groove so easily
If the window seal is firmly seated in the groove (so that it can only be pulled out of the holder with a little pressure), a lot has already been achieved. The next step is to clarify which gap width my new seal must seal.
This is where the window seals differ in terms of the installation height. Different requirements are placed on the new window seals from case to case. It is often no longer possible to adjust the fittings on older windows and the original window seals can no longer seal the required gap air on the window.
Our special silicone seals with a very high gap compensation of up to 9 mm were developed for this purpose. If the old window seals have only worn slightly over the years, the sealing gap can be sealed with a standard seal.
Our TPE seals can be used here. You should also make sure that the closing pressure is not too heavy when closing the window sash. This is a sign that the seal is too thick. A slight noticeable pressure of the seal on the window frame is desirable and completely normal.

Conclusion: Regardless of the different seal shapes and heights, the aim is always to get the leaking windows "tight" again.

It is simply a matter of "trying out" which window seal is best suited to your window. It is therefore not the case that a window seal is only suitable for one type of window.

In fact, window seals can be combined with each other and with different systems.

Gasket for wooden windows - retrofitting, milling in or replacing!

Window seals have a significant influence on the performance characteristics of a window, such as driving rain tightness, air permeability, sound and heat insulation as well as the operation of a window. This cannot be ignored in view of the increasing requirements of new thermal insulation regulations.

This applies in particular to wooden windows, which were manufactured without any window seals until the early 1960s.
At that time, leaking wooden windows could only be additionally sealed with the adhesive seals familiar from advertising.

It is now possible to mill a 3 mm groove in the window sash and fit a new seal.
new window seals for this type of window, special silicone seals are used. This process is very time-consuming and should
only be carried out by a specialist company.

For wooden windows from the 1970s to the present day, wooden windows are generally manufactured with a groove to accommodate a window seal.
In this case, sash rebates or faceplates or stop seals are used to seal new windows. With these wooden windows, the
replacing wooden window seals is not a problem, so that (with a little patience) this should be possible for any hobby craftsman.
The air gap for wooden windows is usually 5mm at the factory, so that the new wooden window seal has a head width or resilience of approx. 7 mm.
resilience of approx. 7.5 - 8.5 mm.

The following must be considered in advance when determining a new wooden window seal:

  • The groove depth (where the wooden window seal is inserted) approx. 7 - 9 mm
  • The groove width (the width of the milled groove of the seal holder) 2.5 - 5.5 mm
  • The rebate height ( dimension of the gasket support on the window ) 10, 12, 15 or 18 mm
  • The clearance ( head width or rebate capacity of your window gasket )

    Anleitung zum Bestimmen der Skizze

This illustration is only intended as a small amount of information. We will be happy to provide you with advice and assistance when retrofitting wooden window seals or seals of all kinds.