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By having the chimney un-capped but not running the fires, are we at risk of this anyway?
Nope.
You get dew, but it evaporates and the building breathes.
Cap it, and you trap the moisture and start causing a problem.
Seal it from the bottom and cap it from the top and you risk trapping moisture. The brickwork might still let water in (if mortar isn't great), so everything has to be great for you to avoid creating long-term problems.
It looked to me to get rapidly expensive and with too many risks I couldn't control... and a chimney sheep was a cheap fix with no risks. Plus I did like that moths might eat that rather than my sofa.
Velocio
deleted
Howard
Currid
I read about this and @Velocio mentioned it in his post. I guess to mitigate that, something like a chimneysheep could be periodically removed to allow the chimney to breathe.
By having the chimney un-capped but not running the fires, are we at risk of this anyway?