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When you convert a basement, the foundation of the house is usually not deep enough. If you want to underpin the building foundation, you should do this step by step. We show how we extend the foundation downwards so that it doesn't collapse. With a step width of 1m, the load of the building can be safely distributed over the rest of the floor, as long as we concrete a new section and the statics are affected at this point. After a week, the new concrete has reached a decent hardness, so that we can concrete the next meter. We show how we attach the formwork to the ceiling and the adjacent concrete and that this only works on concrete that has hardened for more than 4 weeks. Because it is only after 1 month that the concrete reaches the standard hardness and can be worked without breaking out. We would be very grateful for a donation to support our work on YouTube. You can donate to the following Paypal account: [email protected] or the link: http://paypal.me/ImmoSchoen If you like our videos, please give us a nice rating on Google or Maps: https://goo.gl/maps/x2hQPt3HQs9bfG5C8