Building a new Myresjöhus where we have planned a large balcony on the upper floor. The price for the covering plate including labor is about 1000 m2.... This is so the balcony will be "sealed" and the space underneath it can be used even in the rain! How/if can this be solved by oneself and at what approximate cost (the balcony is about 11m long and 2.5m deep… so it's quite a sum 