ᐅ Experiences with WPC Decking

Always keep this in mind with cavity walls... What happens in winter when temperatures drop below freezing? When moisture in the cavity turns into ice and expands...

When I was researching this, I saw many damage patterns that looked like they were caused by this (cracks, splits, etc.).

Of course, it could also have been a coincidence since I was basically looking for that. That’s why we chose solid construction for our build... I would make the same decision again today.

DReffects schrieb:

Joining this thread: I’m also interested in your experiences with WPC, especially the comparison between hollow chamber and solid profiles. Particularly if you plan to screw the decking boards directly onto battens instead of using clips.

You should also keep in mind that manufacturers require a slope of 2 percent for hollow chamber profiles. This is to prevent water trapped inside the chambers from freezing and damaging the board.
We found it difficult to apply an 8cm (3 inches) slope over a 4m (13 feet) terrace, as it seemed excessive — even a glass of beer would look tilted.
That’s why we opted for the solid profile.

seat88 schrieb:

You should also keep in mind that manufacturers of hollow chamber decking require a slope of 2 percent. This prevents water trapped inside the chambers from freezing and damaging the decking.
We had a hard time accepting an 8cm (3 inch) slope over a 4m (13 foot) terrace, it seemed like too much, your beer would even look tilted in the glass.
That’s why we ordered solid profile decking.

Personally, I would always recommend a slope of at least 1.5% to 2% away from the house for any terrace, no matter what the manufacturer says. I definitely don’t want standing water against the house wall during heavy rain.
A 2% slope is exactly that if done evenly, whether your terrace is 2m (6.5 feet) or 20m (66 feet) long.
You won’t notice a 2% slope even in a glass of beer—unless you have a 4m (13 foot) glass.

I can only agree with @Spoony80.

Pierre schrieb:

I can only agree with @Spoony80.

Me too. By the way, the manufacturer of my decking boards generally recommends at least a 1% slope, regardless of whether they are hollow-core or solid boards.

Hollow chamber WPC is probably less heat-sensitive in summer!