ᐅ Ground-level concrete patio with tile flooring and drainage system
Created on: 2 Aug 2017 15:24
E
Eule89Hello,
My husband and I have built a house and now need to take care of the terrace. We would like to have a terrace with a concrete slab and tiles, preferably flush with the ground level. Our builder did not offer this option, so we now have to handle it ourselves. I am not afraid to do the work myself, but I lack some experience and am unsure about what to watch out for.
Currently, there is a gravel base where we plan to pour a concrete slab. I was already thinking about using drainage concrete to ensure proper drainage. The tiles would then be installed on top of that.
I have heard from different sources that a 2% slope is necessary, while others say that a drainage channel between the terrace and the house wall needs to be installed, which then leads into a trench about 1 meter (3.3 feet) deep. I am concerned that heavy rain could wash out the terrace, or worse, undermine the house... Also, I wonder where else the water would go. Is a 1 meter (3.3 feet) deep and 0.2 meter (8 inches) wide excavation really enough?
It would of course be better to allow the water to percolate into the ground instead of directing it into a sewer. Are there any experiences or tips on whether and how this is possible, and what needs to be considered? Or is a drainage channel at the edge of the terrace sufficient? Or is it even necessary at all if the slope is already correct?
This is our first time building, and I am just missing some practical knowledge here.
Thank you very much for any feedback.
My husband and I have built a house and now need to take care of the terrace. We would like to have a terrace with a concrete slab and tiles, preferably flush with the ground level. Our builder did not offer this option, so we now have to handle it ourselves. I am not afraid to do the work myself, but I lack some experience and am unsure about what to watch out for.
Currently, there is a gravel base where we plan to pour a concrete slab. I was already thinking about using drainage concrete to ensure proper drainage. The tiles would then be installed on top of that.
I have heard from different sources that a 2% slope is necessary, while others say that a drainage channel between the terrace and the house wall needs to be installed, which then leads into a trench about 1 meter (3.3 feet) deep. I am concerned that heavy rain could wash out the terrace, or worse, undermine the house... Also, I wonder where else the water would go. Is a 1 meter (3.3 feet) deep and 0.2 meter (8 inches) wide excavation really enough?
It would of course be better to allow the water to percolate into the ground instead of directing it into a sewer. Are there any experiences or tips on whether and how this is possible, and what needs to be considered? Or is a drainage channel at the edge of the terrace sufficient? Or is it even necessary at all if the slope is already correct?
This is our first time building, and I am just missing some practical knowledge here.
Thank you very much for any feedback.
Hello,
I'll start with the patio door:
If you want a flush threshold (modern term: "accessible"), meaning level with the floor, you will need a drainage channel directly in front of the door. The waterproofing here is tricky, keyword: "the forgotten connection." The EPDM membranes that are in contact with the ground must also be twice as thick around doors and windows, so 1.2mm instead of 0.6mm thick.
Alternatively: a threshold with a height/edge of 15cm (6 inches), according to DIN 18195.
Where the water flows from the slope of the terrace afterwards is another matter entirely...
I'll start with the patio door:
If you want a flush threshold (modern term: "accessible"), meaning level with the floor, you will need a drainage channel directly in front of the door. The waterproofing here is tricky, keyword: "the forgotten connection." The EPDM membranes that are in contact with the ground must also be twice as thick around doors and windows, so 1.2mm instead of 0.6mm thick.
Alternatively: a threshold with a height/edge of 15cm (6 inches), according to DIN 18195.
Where the water flows from the slope of the terrace afterwards is another matter entirely...
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