How to insert a window with S-moulding

Replacing a window with S-moulding may seem tricky at first glance, but with the right technique and tools, it’s a job most people can do themselves. In this guide, we’ll show you step-by-step how to install a window with S-moulding, with a neat, durable and watertight result every time.

On the Olsson Parts YouTube channel you will also find a video showing how to do it, Tinkering tips with Olsson Parts – Replacing window with S-moulding.

Step 1: Prepare tools and materials

You will need:
• a new window.
• the old S-moulding, which can often be reused. If this is not the case, you will need a new one, of course.
• assembly paste (acts as a lubricant and makes assembly easier).
• a leather cord.

Important information when reusing an old rubber moulding
If you are going to use an old rubber moulding again, make sure it’s properly cleaned, especially in the groove where the window rests. There must be absolutely no old debris, broken glass or dirt there. Such materials can generate stresses in the glass and cause the new window to break. Scrape clean, wipe off and wash with soap and water or a mild detergent.

Step 2: Installing the moulding
Start by carefully placing the rubber moulding in the hole in the door. The moulding has two grooves – the narrower one is for the door panel and the wider one is for the glass pane.

Step 3: Thread in the leather cord and lubricate with assembly paste
To get the moulding to tighten properly, thread a leather cord into the moulding. To make this process smoother, lubricate the cord and the moulding with assembly paste.

Step 4: Place the window in the door
Carefully press the window with the moulding in place in the door’s groove where the panel is located. Press the centre of the glass pane and hold the door.

Step 5: Tighten the leather cord
Start pulling the leather cord so that the moulding creeps over the edge of the glass. The assembly paste allows the moulding to slide easily and smoothly into place.

Step 6: Check and adjust
Press the moulding firmly around the entire window to ensure that it is stable and watertight. Adjust if necessary to achieve the best fit.

Tip: If you do not have assembly paste available, you can use soap or similar as a lubricant.