Venting a loft through the chimney?

[cajar]

As an alternative to installing vented tiles and the associated expense, would it be feasible to ventilate the loft by removing one or two bricks from the chimney breast as it runs through the loft space? Obviously the chimney is unused so there is no danger of co2 leaking anywhere. I can't see any draw backs and wonder what people think of this idea. My loft currently has 70% humidity and desperately needs ventilation!

 

[mointainwalker]

I don't think it would be very effective because :

a) It is only in one place and not several as per tiles
b) The venting effect caused by wind blowing across the open mouth would be less with chimney as the space caused by removed bricks would be much further away.

 

[tim00]

Definitely a no.
You must not remove bricks from a c/b except ( for ventilation ) at a bricked up fire-opening.
The c/b is disused now but some future occupier might re-use the flue's and fumes could enter the loft and then any sleeping space below.

You should investigate how the humid air is entering the loft. Search on this and other sites.