Forget the sheet metal.
It is completely sealed and doesn't let the panel ventilate dry where it lies flush (on the back of the panel).
I had drip caps above the windows on the gable facade. Those panel pieces were completely rotten as high up as the sheet metal extended. Same facade solution with panel flush against asfaboard. (The solution works excellently otherwise. The rest of the facade panel was not moisture-damaged/rotten despite 25-35 years on a hard-driving rain-exposed southwest gable facade.)
What is needed is a wooden drip edge. And paint that is moisture-permeable. Preferably wood tar.
If it is a modern construction with a thin sill (45 mm), an alternative can be to attach the drip edge/sacrificial board to the deck. Preferably a 28 mm thick decking board (sawn and beveled).
The facade boards at the bottom look good today, but now that I've built the deck, I'm thinking that in the future the water might splash up. However, I think that fear is quite unfounded. My roof overhang is 70cm.
I'm thinking of going with Falu Vapen facade
I think I'll also skip the sacrificial board. As I said, I have an enormous roof overhang.
Yes, if it very rarely rains driving rain that reaches all the way to the wall, there should not be any problems.
We also had a patio that went all the way up to the bottom edge of the facade. The patio is now demolished, and the panel is rotten in the lower dm. However, we don't have 70 cm eaves, more like 30 cm. So I can conclude that a wooden deck, or any other hard surface, that is closer to the lower part of the facade than about 30 cm is a bad solution where the lower part of the facade gets heavily splashed every time it rains, causing it to rot prematurely.
Have a similar question. We have a plastered facade (revetment plaster on a plank frame) where we recently built a terrace on posts, about 1.5m above ground. We placed spacers under the decking against the facade and left a gap of about 2cm between the decking and the facade.
Do we need protective sheet metal against the facade? I think rain will run off and snow as well. In the worst case, we can brush or shovel away the few times snow is standing against the facade. What do the experts say? Not very attractive with sheet metal, so I would rather avoid it...
As usual, it depends...
You could wait and just observe and document this winter, preferably for an entire year. Then you'll see how big the problem is. How often and how much it splashes up, and how long it takes to dry up.
However, I don't know what to compare it with, i.e., where a boundary might be between leaving it as it is or actually taking action.
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