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Thanks. We're hoping to re-render this year so will factor in. But in principle there's nothing wrong with adding a solid object adjacent to an external wall from a damp perspective?
Plan is to cover over the 'roof' with prefab concrete bar and infill blocks then build the wall on top of that in place of the fence. That height up to the roof line is probably over the permitted 2m where we'd like to cap it so not sure what that means for lead/roofs and such.
Plus new soffit/fascia etc.
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Might be best to cut through the render and into a mortar joint then put lead in that joint that covers the top of your wall (I guess onto a roof if that's what the wall is holding then mortar the lead in.