Pictures of 2nd level decks?

YES. It can be done but it's a bit tedious. Since you've already got your deck built, it won't be as difficult as starting from scratch. I would get some 2x4's & place them at the corners of your deck & 1 in the middle between the 2 corners for stability. Place some 2x2's at the tops of all the 2x4's to create a framework. With a staple gun, staple your screen mesh from one 2x4 beam to another & across the open top to close it in. After the mesh has been finished, put some flat panel molding over the staples to hide them & make it more decorative. It should appear like the mesh is sandwiched between the molding & the original 2x4. When attached to the deck properly, you can even hang small pictures on the 2x4's for decorations. Good Luck

Hello Darlene, I have an elevated deck with a screen porch, I do wish it was bigger!

Its the screen tight system, its a wonderful system.

Perhaps you might wish to consider looking at the screen tight system?

We had ours installed in 2015 -with remodel and addition- to our surprise it’s a wonderful system.

It consists of the regular fiberglass mesh screening stuffed into an edge frame sealed with rope like stretchy spline and has a plastic snaps on Tupperware type sealing strip to cover your raw edge.

We just repaired a huge panel after a dog excitement accident. It was pretty easy to work with. We just bought replacement screen + tub of the spline and a hand spline tool and the job was completed without much effort. I would say its diy friendly....at least the repair was. It was far easier than a more old-school staple screen and cover with it with wood —system that we had a prior residence back in the late 1990s.

https://www.screentight.com/screening-systems/

https://www.screentight.com/

The intense summer heat exposure on the unsheltered deck side is uncomfortable. Best wishes with installing your screen porch.

Before you do anything, you have to check and make sure that the footings of your existing deck are big enough and deep enough to carry the extra load you plan on putting on it. That includes the materials used to build the new part of the deck, but the load of furniture, people, etc.