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Yeah pretty common, you'll see that on a lot of Victorian properties. Concrete significantly heavier and cheaper than slate or clay. I've never heard of it causing a roof to collapse but I suppose it could cause damage of there's other issues. Wet or dry rot probably from leaks or lack of ventilation probably a greater concern.
Waiting on full report back but wondered if anyone had had similar - surveyor mentioned that the roof has at some point had new heavier tiles to replace the old slate tiles and that it needs some additional support. It's a victorian terrace house.
Where I'm currently living (also victorian terrace but renting) I can see that the majority of houses have switched from slate to concrete tiles so must be quite common? Annoying though!
Was a full survey - structurally all OK