Damp disused Chimney

Dermot2468

I have had a problem with a disused chimney where 2 mantelpieces were removed (one either side). The gap was filled with blocks and plastered over, and a ventilation hole with grille was left.

Not long after the paint became damaged due to damp and mould started to grow in the attic.
I thought this was due to rainwater coming down the chimney so in the summer I installed these caps on the offending chimney.

The problem is that the damp is still present. I have checked the vents and there is a decent amount of air being pulled up the chimney so I don't think its a ventilation problem.
You can see from the pics I have attached the chimney is damp to touch in the attic.

The only other place where moisture could be getting in is a leak around the chimney flashing. I didn't get a chance yet to inspect from the exterior but the rafter seems damp.







Anyway just wondering if anyone has any other advice on how to tackle this. The problem is only present on this chimney which has had the 2 mantelpieces removed, which means it must be related to this.
Is there anything I could be missing?

Thanks,
Dermot

Bomberman

By looking at these photos it looks like the flashing around the chimney is damaged or come away. I would check this before doing anything else..

Carlow52

+1 with Bomber

fires probably kept them dry