Waterproofing concrete floor patio

[Ynnoj85]

I have bought a house with a patio on top of the garage where moisture is coming in from above since the current waterproofing is not up to standard.
There was some epoxy previously applied on the concrete, which is painted, so it has detached almost everywhere.

So, I plan to remove all the epoxy and sand the paint off the surface, but what should be used as a waterproofing layer afterward?

I've googled and read a bit about different options, but they are from old threads, so maybe there are new options on the market nowadays...

I had an idea to apply some sort of surface finish and then paint the surface, but it might not be that simple. I don’t know what it looks like underneath once the paint is removed...

As I am completely new to this area, I would gladly accept tips and advice on what can be done.

Thanks in advance

 

[Rickard.]

https://www.byggahus.se/forum/threads/laga-undersida-pa-balkonggolv-hur.348948/#post-3360556

Here you can read how I solved similar problems. I can add that it is possible to cast in waterproofing on balconies if one values concrete as a surface layer highly, but it is expensive.

 

[Ynnoj85]

[link]

Here you can read how I've solved similar problems. I can add that it's possible to cast in waterproofing on balconies if you highly value concrete as a surface layer, but it costs.

Okay. I don't value the concrete as a surface layer that highly; I'm more looking for the simplest and smoothest solution possible. As I said, I'm completely new to the subject and want to make it as easy as possible if I'm going to do it myself, and learn a bit along the way, of course

Since there's no roof overhead, it's good if it's something that can be resolved in a fairly short time in case the weather turns bad, so maybe I can avoid covering with tarpaulin, etc.

 

[Rickard.]

This is trickier than one might think as it should be viewed as a completely flat roof but with more traffic and wear than an ordinary roof is subjected to.

Since it's not an entirely uncommon issue, I'm also curious about new solutions, but unfortunately, I don't know of any that can be done by oneself. Maybe someone else here knows.

 

[Ynnoj85]

This is trickier than you think as you should see it as a completely flat roof but with more traffic and wear than a regular roof is exposed to.

Since this is not an entirely uncommon issue, I am also curious about new solutions but unfortunately, I don't know any that are possible to do yourself. Maybe someone else here knows.

Okay, yes exactly. I was in contact with a flooring company that would sand and then apply some polyurethane layer similar to those in parking garages etc. It would cost close to 40,000 SEK for about 25 sqm, I thought it was quite steep but maybe that's what you have to expect...

 

[Ynnoj85]

Another option I saw was a form of rubber sheet that you can lay down and then perhaps build a deck on top?

https://www.bauhaus.se/gummimatta-firestone

 

[Rickard.]

Don't know the difference between pond liner and EPDM roofing, but if I suspect that they are quite similar, it will probably work if you can lay the liner without seams. It's also fine to glue with contact adhesive from a can.

 

[Ynnoj85]

Without a seam, I probably won't be able to lay it since the patio is wider than the canvas. Then I have a railing that goes around the patio, which is cast in the concrete, so I need to find a way to get around that somehow....

 

[Villa1949]

I had the same problem with a patio above the garage. Ended up tearing down the garage... too expensive/complicated to fix in a good way in my case, and the garage was very rundown.

 

[Rickard.]

Check with the nearest roofing company what they would charge to weld tar paper over it. It's quite cheap and doesn't require any preliminary work. On top of that, you place a loose decking with some caution to avoid puncturing the waterproofing layer.

 

[Peter2400]

Without a seam, I probably won't be able to lay it as the patio is wider than the fabric. Then there's the railing that goes around the patio, which is cast in the concrete, so there must be a way to get around it somehow....

How wide is it then?
What does the railing look like?
Do you have a heater on the patio?

 

[Ynnoj85]

How wide is it then? What does the railing look like? Do you have a heater on the patio?

The patio is roughly 4.3x something meters by 5.5 a little over at the longest spot. So in terms of width, it might still work But there's also the fence to consider... Then the stairs also need reworking as there's the same problem going on there but not as bad yet.

The heater is from inside since we have wallpapered, so it's just temporarily placed there.

 

[jimmie.p]

This works if you want tiles on the surface. http://www.ardex.se/produkter/taetsystem-och-vaatrumstillbehoer.htm?product=ardex_7+8&key=9

 

[Ynnoj85]

This works if you want tiles on the surface.
[link]

Yes saw something about that there. Tiles might be something but I've never laid tiles so the question is how good it would be

 

[Ynnoj85]

Is it possible to lay tiles on roofing felt if you hire a roofer to lay felt over the entire surface?