Water on concrete garage roof

  • Erstellt am 2014-03-30 18:49:33

xdiver

2014-03-30 18:49:33
  • #1
Hello,

We have attached the garage directly to our house. It is built with masonry and the roof is concrete. The sealing between the garage and the house has already been done. There is now a kind of "black foil" on the garage and metal sheets are installed all around the outside. Near the house and garage is the water drainage. Gravel is supposed to be spread on the garage later.

We have often noticed that after rainfall the water always remains standing and does not drain off but only disappears through evaporation. The water also stands on the side facing away from the house (there is no drainage here).

A colleague said that you could pour screed on top and then create a slope towards the drainage. Does it work like this with the screed? Or are there some counterpoints (frost, etc.) that have to be considered?

Do you perhaps have another possibility of how to get a slope here? Do you have any other ideas on how this problem can be solved?

Thank you

regards xdiver
 

emer

2014-03-30 18:55:35
  • #2
Who put the roof on the garage? They must also professionally ensure at the end that water can drain according to the [specification].
 

Wastl

2014-03-31 09:21:15
  • #3
Applying screed on top again could cause structural problems. Let the garage builder come and demand rework. The slope on the roof must point towards the drain (you can measure it with a spirit level).
 

Bauexperte

2014-03-31 11:45:52
  • #4
Hello,


Did you build the garage yourself or commission a shell builder? And who came up with the idea of creating a slope towards the house?


The garage is based on structural calculations; so it depends on how load-bearing the existing masonry is. Only when this is known can such a measure be considered.


The slope should be >2%.

Either way, it reads like a botched job, and from my point of view it must be clarified who is responsible. If you built the garage yourself, you have to take responsibility and bear the costs of the renovation. If there is a proper contract for the construction of a masonry garage, then step on the contractor's toes and immediately demand in writing that the defect is remedied.

Regards from the Rhineland
 

xdiver

2014-03-31 21:10:22
  • #5


The garage was built by the shell builder.
The idea to lay the drain there came from the architect. When I asked why the water does not drain here, he just said it wasn’t that bad.
Put stones on it and then it will be fine.
He also thought that the drain could be relocated, but where there is no slope, no water flows.



I will then give that to the architect as homework.
Do you have any link or regulation that I can hold under his nose regarding garage roof construction...

Can screed affect the statics that much? As far as I know, the roof is designed for 85kg/m². So 5 cm shouldn’t cause any structural problems, or am I wrong?



Regards
xdiver
 

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