As a last resort it would be simple enough to replace the pitched roof with a flat (maybe green?) roof. Salvage those slates though as they look very good quality. Quite often though if you just remove the roof structure it will take the pressure off the walls and slow the structural decay. You might need to cover the tops of the walls over the winter to keep rain and frost out.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
Possible you could strip the roof yourself to save on some labour cost? would also take all that vegetation out of the pointing if its structurally compromised. Would also give a better idea of how bad the walls are.
Would it be possible to build an internal structure ... uprights and a rectangular frame ... to take the majority of the weight of the roof off the walls? I’ve seen this done with medieval Suffolk barns.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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@wild edges, the slate are indeed very good quality. Most of them are Welsh Penrhyn slates and I could sell them on if I have to have it demolished.
I've had 4 roofers look at it and am waiting for the quotes to come in.
build an internal structure ... uprights and a rectangular frame ... to take the majority of the weight of the roof off the walls? I’ve seen this done with medieval Suffolk barns.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.