I've got a small shed in my garden, and it used to be a great home for many spiders (and two mice). Walls are thin wood, floor is solid concrete, and eternit roofing.
A few months ago, my father helped me to clean it out completely and apply drywall to all inside walls + ceiling, with some latticework and plastic sheeting between the old outer wall and the new inner drywall to keep the inside dry. It's now a clean and dry space.
The only entryway for insects is through the door, which is a problem because it's a sliding door mounted on a rail on the outside of the shed, so there is a very small gap all around the door, and of course spiders are finding their way back in.
How can I effectively keep spiders out of this space?
As long as I only use it for storing shovels, who cares about spiders. But I'd like to use the newly upgraded space for storing other things that I don't want ruined by cobwebs and assorted gunk.
I believe this question is more about gardening than about DIY because it's about how to fight spiders, not how to build a shed.