This will prevent water damage that can occur when water is allowed to get underneath the siding itself.
Cutting vinyl j channel.
Researching the proper steps for installing j channel.
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.
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Cut a tab in the bottom of the side j channels and fold under.
Installing j channel around windows can be a difficult part of the installation process.
For the doors cut your side j channel pieces similar to the way you did for the windows.
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For doors and windows cut and install the top j channel piece flush with the outer face of the side j channels.
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