Looking for ideas on building privacy walll on back deck...

https://www.pinterest.com/mindylou1960/deck-privacy-walls/?lp=true

Have you thought of curtains? You can make them with canvas drop cloths like this:

https://www.scatteredthoughtsofacraftymom.com/no-sew-drop-cloth-patio-curtains/

Both interior and exterior walls here: https://www.youtube.com/results?search_query=diy+interior+privacy+wall

Make your frame & use the resin lattice, very pretty when done.

I used lattice and framed it. See pix.

A 2×4 frame with old barn tin will last along time and maintenance free will give rustic look, or you can paint it any color.

I made a frame of 1 by 5 the size of the opening with a cross brace at chair back height. I bought sun filter fabric in beige online...it was less expensive than anything else I had looked at. I stapled the fabric on both sides. Keeps the sun out yet lets some of the breeze though. Makes a nice background for my porch furniture. Been up nearly 3 years and looks new. Enjoy.

There are a lot of ideas today... but consider your lighting and how much privacy you actually want. Sometimes we forget about these and get carried away and have a dark space. Planting are also nice to use for privacy, just make sure they are not invasive, if they are pot them up so they can't spread to where ever they want. If your going to grill you want to make sure you have air flow I have burnt many things and glad I had an open space for it to blow away, it did get in the house once, smelled for days. I'm just saying anything can happen. If you have pets looking at the bowls I would make sure they get a nice cozy corner to lay in, both out of the way and out of the wind and elements.

Fabric shower curtains make great dividers and don't cost much. Hope this helps!!

I made a 24 ft x 18 ft patio out of conduit & I used plastic lattice with zip ties. & it was up for over 10 yrs until we moved & I used it again & moved again & used again. Or you can take the cloth like screen to hang up & use eyelets with medal show curtain hooks on conduit as curtain rod. It will keep sun out but air can go threw & you can't see threw it very good. Good luck.

I needed shade on the west side of the patio but that's where most of the wind comes from. So I used cement post holders on the patio to support 4x4 posts, and 1x6 boards set at an angle for the wall. It lets in light and air but keeps the Texas sun and heat at bay. Privacy is a perk.

If you have a low semi open fence you can weave fabric between the uprights. Can't remember which mail order catalog I saw it in.