Do people tape or seal these spots? There’s a gap where water can get in.
There shouldn’t be any water up there. If there is, you also need to worry about the wallpaper.
I swear I read a thread about this when I first got my camper and had the same question and the majority said not to seal it because it will end up holding moisture in vs preventing moisture from getting in. I think the gist was little if any moist should get up that high and if it does it needs a way to dry.
I use clear Dynaflex 230. They sell it in small tubes. It’s durable and very clear.
You want air gaps there to allow breathing behind the shower panels. If anything make sure it’s sealed well at the base and by the shower door. The top you don’t need to worry about
Where the wall meets the wallpaper at the top? Yes.
Open the window be sure to always have a bottle of bleach nearby. Also, dollar tree sells these things that draw the moisture out of the air..
If you are getting water down in there, you can pull it back and run a bead of clear silicone. Technically however, it won’t “breath” so I can see maybe water getting trapped potentionally. I have not done that, but instead put big blobs of silicone behind it by pulling it back and just emptying a tube inside there , and then bracing it until it dried. That was to stop “flappy walls”, from feeling cheap. Now my walls are glued to the inner Luan plywood, but there are still air gaps going up and down.
Source: Waterproofing the shower
