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.
How to seal gap between siding and concrete.
Put on your gloves bring a rag for cleaning spills then visit the cracks and gaps you spotted along your siding.
In the course of repairs some of the caulk weatherstripping between the trim and the house came off.
A closeup of the backer rod.
It seems too wide for a bead of caulk.
Since some of the siding looks like it will need re priming and painting make sure that you use a paintable type of caulk.
What s the best way to fill that gap.
The best solution here may be to clean up that area of all debris let it be fully dry and then apply a bead of qood quality exterior grade caulking material.
Simply apply this inexpensive filler into the cracks to seal.
I have a stucco sided house that i am repairing repainting.
In this case what i would use is a polyurethane caulk made for masonry like this one.
Loctite pl10 often the gap to be filled is quite deep.
Another option is metal step flashing.
In that case the use of backer rod before caulking is recommended.
The gap between the wall and the trim is fairly large at least 1 2 inch.
There is a gap between the siding the concrete that is probably 1 2 5 8 inches wide along the row of siding.
They are typically mechanically robust adhere extremely well to almost everything especially wood and concrete and are stretchy enough for seasonal building movement.
If you want to seal it use foam backer rod of a size that will just barely stuff in there.
Note that there are various types of caulk.
How to seal gap between siding and concrete the bottom row of siding hardipank overlaps part of the concrete footer on my house.
The urethane caulk sealants were developed for the joints between the panels in concrete tilt up construction.
Step 6 seal small cracks and gaps in your siding under 1 4 inch wide using an acrylic latex caulk.