Zip Cover
The best way to prevent moisture from penetrating the zip is to protect it with a cover.
The cover must be positioned so that rain can run off quickly and easily. The wind should also not be able to push water under the cover. Particular attention must be paid to the stop part of the zip, as this is the easiest place for water to penetrate.
The dimensions of the cover depend on many factors. In principle, it should cover as much of the zip as possible. However, the zip should still be easy to operate.
All elements of the solution shown are made of the same material, a TPU-coated Cordura fabric.
First, we weld in the zip, as described here.
Then cut the fabric around the zip on one long side and at both ends. This must leave a sufficiently wide edge, as you can see.
Now we insert a strip. This strip is the actual cover. As you can see, the TPU side of the fabric is facing inwards. The protruding edge is exactly the same width as the neckline.
To connect everything firmly and watertight, we cut a U-shaped cover as the last element, which covers everything sufficiently well.
Everything must then be carefully welded together. Weld from both sides to connect all layers securely.
Use the awl to check along the marked edges to ensure that everything is tightly welded. It must not be possible to get under the material with the awl at any point.
Once the back...
...then the front side. Due to the design, a small overhang remains here. If you want, you can carefully cut it off. I always leave it as it looks tidier, I think.
When finished, the back should look like this.
The cover on the front looks relatively inconspicuous.
The zip is well protected.
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