Finally got time to do a partial repair of balcony in flat. House was built in 70s and balcony part wasn't touched much from that time, although in 90s simple windows were installed (before it was open), but it was still cold and had open gaps. Wooden planks that covered steel barrier also had wide gaps between them, so in winter it had near -10 C temperature in coldest days. That wasn't fun.

I've planned to do something simple in autumn, just as temporary measure before full-scale home renovation, but current situation in this forsaken place paused all money-consuming plans for indefinite amount of time. Plan was simple, remove old wooden planks, place insulation where it can be placed, fill all gaps and close everything with cheap PVC planks. Considering that I'm not an experienced builder at all, I've decided to don't touch anything complex including windows, because their replacement requires replacing the steel barrier. It is also pretty high here, and I'm afraid to do anything with barrier anyway.

First I've used polyurethane sealant to fill small gaps, then started to remove planks. Reality as always broke all plans, because I've discovered that everything is skewed, curved and half-broken inside. Some parts go off from straight lines for few centimeters, right part is completely open (can see neighbor one), rusty nails breaking on removal etc. I also overestimated some sizes and underestimated amount of insulation cutting for filling everything, so it was very time consuming.

So it is transformed from first photo to last, but I can work only on weekends, so it will be finished completely in next month at least.