Caulk along the edge of both boards that overlaps the siding with exterior caulk for added moisture protection and.
How to do and outer corner siding wood.
The corners of vinyl siding are one area where moisture can get in under the siding.
Outside corners are typically trimmed with two overlapping trim boards.
For the inside corners rip a square cross section like a 2 x 2 to allow the siding panels to butt squarely into the corner trim.
In lieu of nails you can attach corner trim with trim screws.
You drive them with a torx screwdriver bit.
Then install the corner posts over the flashing.
These tips will help you to do a professional installation of your vinyl siding.
How to install individual aluminum siding corners of hardie plank siding.
To prevent this put flashing about one foot on each side of the corner.