If you cut the ends at a 45 degree angle and create a small cut on the top piece of the j channel water will be able to run down the channel without getting caught inside.
Cutting vinyl j channel.
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This will prevent water damage that can occur when water is allowed to get underneath the siding itself.
Item 1339368 model 260351031.
For doors and windows cut and install the top j channel piece flush with the outer face of the side j channels.
For the doors cut your side j channel pieces similar to the way you did for the windows.
Researching the proper steps for installing j channel.
Midwest tool cutlery mw vn j chan cutter notcher.
Installing j channel around windows can be a difficult part of the installation process.
Cut and bend the drain tab.
Klein tools k12065cr wire cutter and crimper tool for wire cutting stripping crimping and twisting 8 18 awg solid.