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I hadn't even thought of that. Even a shallow run off of 1.5° is going to be ~8cm height difference over 3m, and that's going to look weird.
NotThamesWater-
I didn't think of it; I always run my designs past my dad before I commit and he always finds something wrong with them.
I'd accept like 5mm max over my 4m width but any more and it would just start to look like it was just a shoddy job.
Running the boards perpendicular is another option, but the cladding is vertical, it would be impossible to get the boards to line up with them and it would annoy me that they didn't.
@spenceey 6mm gap between boards, the boards will be 4m long so no butting in the longitudinal direction will be needed.
Hovis
I'm building a deck for my garden office and am wondering about a slope for drainage. The boards will be grooved composite and run parallel to the office. I was going to have it slope slightly away from the office ie perpendicular as the garden naturally slopes anyway, but am wondering if I will have a standing water problem in the grooves since they will be level in their orientation? I don't really want to introduce a slope in that direction as it would be an eye sore.