My deck has double joists on the east and west edges that seem to be separating. I imagine water is getting into the space between them and prying them apart. This deck is located in Minnesota.
In the images, you can see the joists are screwed together. there also seems to be some glue residue. The cracks have small rocks and debris in them.
How can I fix this?
I have many issues with this deck and will likely have to ask several questions on this site. The scope of this question is simply what to do about the double joists that are separating.