Condensation in pitched roof with ventilation

Hi there, roof felting will involve stripping roof removing existing and replacing... very expensive. If your current boiler is the cause of humidity in the loft space then a combi conversion will save you alot of money and earn you money back in terms of efficiency. The combi conversion should take 1 to 2 days max and also improve your current heating and hot water setup. All the best

Hi, I think changing the felt would obviously be an expensive solution but I think maybe the best thing to do for you as changing the boiler might make the issue you say slightly better but also might not solve the problem completely due to the warmth of the house in winter not being able to breath up through the cavity’s and expell into the roof space and out the house. If the attic is empty and not being used for anything it shouldn’t be causing mold in the upstairs rooms in my opinion. Both boiler and felt would be best scenario for a long term solution but even a quick fix could maybe run a dehumidifier for a minute until you decide what way to sort this. Hope that helps

If your eaves are vented then vent your ridge by putting a dry ridge system on it will circulate air and you won’t have to change felt because there will be a full circulation of air when you cut felt at ridge tree and eaves are vented hope this helps

I would recommend extra vent tiles and maybe soffit ventilation 1st for observation, inspection of felting etc and advise the best way forward (boiler or roof work)