Under deck drainage system?

[Svengberg]

Hello!
Has anyone heard of this?
I intend to build a sunroom with a balcony on top.
Here is a sample picture so you know what I want to do.

The balcony will have a deck, and the sunroom will be built on a concrete slab.
To handle the rainwater that falls between the decking boards, I've been considering something called "under deck drainage system."
Does anyone know what it's called in Swedish, and do you have any experience with it?
Or perhaps you've solved it in another way; I'm grateful for suggestions, how would you do it?
This is what the "under deck drainage system" looks like.

Best regards,
Mikael

 

[A.G]

Metal roof under the deck and perhaps a gutter.

 

[Svengberg]

Absolutely! Do you have any tips on how to handle the metal roof around the posts to prevent water from leaking in?

 

[A.G]

Unfortunately not. But you can build so that the posts do not go through the roof. Then the railing is mounted in post shoes (type).

 

[MagicFingers]

https://www.blocket.se/goteborg/Torrt_under_Altan__Balkong__Veranda__Terass_56787022.htm?ca=15&w=2

maybe?

 

[PatrikJo]

I had built the conservatory with a proper roofing felt, and installed some form of post anchors through the felt. I can't imagine there would be any problems sealing it. Then it's just a matter of building a framework on top that is screwed into the post anchors.

 

[anthorne]

Considering similar options as I want to weatherproof under the existing balcony and eventually build decking and walls. My first thought was to stretch reinforced plastic tarpaulin between the joists, but now I'm leaning towards installing a corrugated plastic roof underneath instead and redirecting it with a downpipe mounted on the beam that the joists rest on.


First option


Second option images below:

different dimensions of joists that are 1 cm lower for each one to create a slope


downpipe mounted on the beam at the bottom

 

[A.G]

How do you seal between the roof beam and the plastic roof?

Feels like a risk for leakage in between there.

 

[anthorne]

How do you seal between the roof beam and the plastic roof?

Feels like there's a risk of leakage there.

With the tarp, the plan was to put it on the joists so that I can direct the water over the beam, but for the second option, I'm currently considering having a downpipe on the inside of the beam, maybe not the most optimal... happy to hear more ideas on how to do it.

 

[A.G]

We have raw wood and then a sheet metal roof and then decking on it.

 

[anthorne]

Suspect that everything becomes easier when you build entirely from the beginning with everything in mind; everything becomes immediately trickier when you already have the balcony built and want to have a conservatory underneath afterward.

 

[Daniel kofot]

Suspect that everything becomes easier when you build completely from scratch with everything in mind, everything immediately becomes trickier when the balcony is already built and you want to have a conservatory underneath afterward.

Hi,
Facing a similar problem. Would be interesting to hear what you did and how it went. Did you go with option 2?

 

[anthorne]

Hi,
Facing a similar problem. Would be interesting to hear what you did and how it went. Did you go with option 2?

Unfortunately, we haven't done anything, but focused on other projects for now.. but I'm still interested in a reasonable solution to the problem if someone has one.