Another option is metal step flashing.
How to seal gap between siding.
How to seal siding to keep out mice.
What s the best way to fill that gap.
If you want to seal it use foam backer rod of a size that will just barely stuff in there.
Find the entrances mice use to enter your home.
The siding expands and contracts with temperature and humidity.
You will need to do this to each section experiencing the gap.
The bottom should remain permeable so that if water gets behind your siding for whatever reason then it has an escape path.
If you don t seal them properly water can run off the roof and into your home.
Hold firmly for several minutes and allow it to secure.
Fascia boards attach to rafter ends along the roof line.
In my opinion caulking between the seams in any lapped siding either horizontal or vertical is not good practice but not just because of any potential vapor barrier effect.
Do not seal the bottom with any sort of impermeable caulking nor spray foam.
It seems too wide for a bead of caulk.
Look under the siding at the area meeting the foundation of your home for holes and gaps.
Begin by applying a glue to the back of the siding and pressing it completely.
Without a little more detail i can t say for sure if the gap is intentional or just an artifact of the siding installation method.
Albeit tedious you can choose to install that mesh if you wish because it is permeable.
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Think of a wood home as a living thing.
The porch studs can be caulked to the house sheathing a vertical strip of folded asphalt felt can be installed tight to the corner and trim will cover the gap.
How to seal fascia gaps in a roof.
If water gets trapped.
If you don t want to cut your siding back and the siding has a clapboard pattern leaving many gaps these gaps can be filled with canned spray foam or caulk.
Crawl around the exterior of your home and use a flashlight to find cracks holes and gaps.
It needs to move and breathe.
I have a stucco sided house that i am repairing repainting.