ᐅ Creating the Correct Slope for a Patio

Hello, I am currently working on building my terrace. A WPC decking is planned. First, the borders need to be installed. How would you create the slope according to the attached sketch? Thanks for your feedback.

WPC decking normally installed on a substructure – what kind of base? Deck boards (whether WPC or wood), where water can drain underneath, I always lay level. No slope on the terrace – it is not necessary unless you want to seal the gaps between the boards as well.

The ground is compacted with a mineral mixture, with standard pedestals placed on top, followed by the WPC decking boards. But without any slope? The manufacturers and everyone always say that there should be a slope there as well.

Pedestals are used precisely to keep the surface of the terrace level. Water then flows through the joints down to the substrate below the pedestals. This substrate should have a slope … in your case, away from the house …

Thank you for your contributions. As a precaution and because the manufacturers also recommend it, I would still create a slope. So my question is more about how to represent the slope and the heights. Side A is 3 m (10 ft) long with a difference of 6 cm (2.4 inches), side D is 1.5 m (5 ft) long with a difference of 3 cm (1.2 inches). That means the 3 cm (1.2 inches) difference on side C would need to be compensated for. But wouldn’t that look odd, especially considering the steps that come before, if side C is uneven?

We have a similar terrace with WPC, a closed deck, used as a barefoot walkway.
I wouldn’t manage slope C; you need that corner for walking around the table when many people are present.
Between the terrace doors, there is a height difference of about 2cm (1 inch), which means a threshold is necessary.