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About 60cm, and awkwardly shaped - too thick for me to be comfortable with those ladders that have a hook contraption for the top of the sill. Plus they're a pain to store.
Spxtz-
@Spxtz for a second floor tenement you're going to have a pretty hefty set of ladders. Storing those is quite an undertaking.
I was in a second floor tenement for a few years in the West End and felt some sense of ease after I got a key to get roof access - in most of Glasgow you can walk from tenement to tenement on the roofs in a gully in the centre which is why seagulls love them so much. So if you couldn't get down the stairs you can always get on the roof and move a safe distance away.
Its a lot more costly but some tenements have also had metal stairs installed which might be a move some factors push for given the last few fires that have sadly happened in the city.
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Something like this maybe https://www.safelincs.co.uk/easyscape-fire-escape-ladders/ although I'm not sure if this specific one is long enough.
Or this for the comedy description https://www.amazon.co.uk/Ladder%EF%BC%8CEmergency-Carabiner-Children-Balcony%EF%BC%8CEmergency-Ladders/dp/B07VN64R76
andos
aggi
Oooff. How thick are the sills?