Building a Waterproof Subroof for Existing Deck Flooring

[tosa007]

The current plastic roof does not connect completely tightly to the concrete pillars in the middle of the patio, which causes water on the decking floor to find its way down and run along the pillars. I am looking for a construction that masks the pillars from below so that a new underside roof with the right slope (preferably corrugated metal roofing) can be built up and connect to the pillars to make it tight. What solutions are feasible? The dimensions of the patio are approximately 8 x 4.5 m with standing height underneath, and the number of concrete pillars is 8.

 

[Beachboy72]

Hello!

Looking for a similar solution, I'm planning to build a carport with a terrace on top measuring 6.5 x 5m.

As it stands now with the drainage (hehe), I'm thinking of screwing a metal roof under the "terrace" and possibly framing further to create an additional ceiling. That is, split, for example, a 70mm beam diagonally, screw one half in place, then screw the metal roof from underneath, then attach the other half of the beam and then the inner ceiling.

If you use 70 or 90mm and have a slope of about 0.5mm per meter, there should be enough space for spotlights between the inner ceiling and the metal. What I would PREFER is to have a nice inner ceiling directly underneath, but I think it will be difficult to seal with spotlights and electricity, and most ceilings seem to be "crimped" and it doesn’t look as nice underneath, so I'm leaning toward the first suggestion now that I read it. Then I can use the same boards as on the house in the same white color.

However, the drainpipes and such are a bit tricky; I'll have two support beams approximately 2.5m apart at about 40cm, I think, and I believe I can manage with 170 or 220 over 2.5m with cc60cm. This means I can have drainage towards the middle, as I only want a total height of 40cm + decking and inner ceiling.

Then there will be an overhang, not sure how I'll do that without having beams on top of the support beam, will need to think more about that. The posts can only be about 4m out.

 

[nino]

Hi!

Looking for a similar solution, planning to build a carport with a terrace on top, 6.5 x 5m,

As it seems now with the drainage (hehe), I'm thinking of screwing a metal roof under the "terrace" and possibly continue framing to create another under-roof.
That is, "split" e.g. 70mm timber diagonally, screw one half, then screw the metal roof underneath, then screw the other half of the timber and then the under-roof.

If you take 70 or 90mm and have a slope of about 0.5mm per meter, you could probably fit spotlights between the ceiling and the metal.
What I would MOST like is to have a nice ceiling directly underneath but I think it will be difficult to seal with spotlights and electricity, and most roofs seem to be "folded" and it doesn't look as nice underneath, so I'm leaning towards the first suggestion now when I read it. Then I can use the same boards as on the house in the same white color.

However, downpipes, etc. will be a bit tricky, I will have 2 beams every 2.5m at about 40cm I think, and I think I can manage with 170 or 220 over 2.5m cc60cm. That means I can direct drainage towards the middle, because I only want a total height of 40cm +decking and under-roof.

Then there's going to be an overhang a bit, don't know how I'll do that without having timbers on top of the beam, probably need to think more there. The pillars can only be about 4m out.

I was thinking something similar but I think the forum has given me other ideas and it'll be a real roof as they suggested.
Then you know it's sealed and you can insulate everything in the future if you want to.

Edit: thought it was my thread you were writing in.