Hello everyone, I hope you can help me here.
We are in the process of waterproofing the basement of a house from the 1970s from the outside.
The steps are mostly clear and have also been specified by the energy consultant.
1. Excavation down to the foundation / by the way, this is a strip foundation.
2. Primer, 2 coats of bitumen, XPS boards, dimpled membrane.
Please correct me if I have forgotten anything.
We have now encountered a "problem."
We excavated the first 5 meters (see picture 1), everything is fine, the wall goes straight down to the foundation. We can insulate this neatly and close it up again. Then we continued digging.
Suddenly, we noticed that the concrete only extends about 1 meter (see picture 2) and does not go straight down like a wall all the way to the bottom as it does in the first 5 meters.
After some consideration, I realized that this part of the house was added later. About 1.50 meters (5 feet) were added afterward, so this is not yet the basement wall! The basement wall only starts after a depth of 1.50 meters (5 feet). To insulate this basement wall, I would have to excavate under this additional structure to reach it. Of course, I cannot do that as it would endanger the structural integrity...
What we have done now is the following:
We have installed formwork and poured about 20 cm (8 inches) of concrete down to approximately the level of the actual basement wall (see picture 3). We would now insulate on this.
Picture 5 shows a complete view of the wall we created alongside the real basement wall.
The question is,
Is this insulation effective?
There is still about 1.50 meters (5 feet) of space between this newly poured wall and the real basement wall.
I ask because I have the same issue on the other side (see picture 4), which is another 10 meters in length, with exactly the same situation of the 1.50 meters (5 feet) distance to the real basement wall.
I would simply do the same there... excavate everything, pour a wall about 2.50 meters (8 feet) high, and then insulate on that. It is a huge effort, but since I am already at it...
It should also be mentioned that there has never been moisture or water in this basement...
The goal is simply to achieve KfW 70 standards and to have a well-insulated house to save energy costs.
I am really grateful for any advice.
We are in the process of waterproofing the basement of a house from the 1970s from the outside.
The steps are mostly clear and have also been specified by the energy consultant.
1. Excavation down to the foundation / by the way, this is a strip foundation.
2. Primer, 2 coats of bitumen, XPS boards, dimpled membrane.
Please correct me if I have forgotten anything.
We have now encountered a "problem."
We excavated the first 5 meters (see picture 1), everything is fine, the wall goes straight down to the foundation. We can insulate this neatly and close it up again. Then we continued digging.
Suddenly, we noticed that the concrete only extends about 1 meter (see picture 2) and does not go straight down like a wall all the way to the bottom as it does in the first 5 meters.
After some consideration, I realized that this part of the house was added later. About 1.50 meters (5 feet) were added afterward, so this is not yet the basement wall! The basement wall only starts after a depth of 1.50 meters (5 feet). To insulate this basement wall, I would have to excavate under this additional structure to reach it. Of course, I cannot do that as it would endanger the structural integrity...
What we have done now is the following:
We have installed formwork and poured about 20 cm (8 inches) of concrete down to approximately the level of the actual basement wall (see picture 3). We would now insulate on this.
Picture 5 shows a complete view of the wall we created alongside the real basement wall.
The question is,
Is this insulation effective?
There is still about 1.50 meters (5 feet) of space between this newly poured wall and the real basement wall.
I ask because I have the same issue on the other side (see picture 4), which is another 10 meters in length, with exactly the same situation of the 1.50 meters (5 feet) distance to the real basement wall.
I would simply do the same there... excavate everything, pour a wall about 2.50 meters (8 feet) high, and then insulate on that. It is a huge effort, but since I am already at it...
It should also be mentioned that there has never been moisture or water in this basement...
The goal is simply to achieve KfW 70 standards and to have a well-insulated house to save energy costs.
I am really grateful for any advice.
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