ventilating chimney space around insulated liner

[toucan]

Morning,
I'm planning chimney maintenance work in July. Its a stone chimney, cement rendered above the roofline with wood burner and stainless lined flue installed 8/9 years ago. There is no ventilation of the space in the chimney around the liner. Is there any reason why I shouldn't put a small vent just below the flaunching - sloped pipe to allow space to breath and help remove moisture. Presumably no matter how well flaunching is done there will always be some moisture getting in.

 

[Basher]

Previous owners of our cottage had a HETAS registered company put a flue liner in the large period chimney for a woodburner. They put an air brick in the side of the chimney above the roof line at the time. I assumed that was standard practice - as you say, it's preferable for the void between the liner and chimney to be ventilated.

 

[ShaunCorbs]

It might be filled with vermiculite hence no need for an air brick

 

[gmartine]

....or remove a chimney brick or two in the loft space and back fill it with vermiculite if there isn't.

Two birds and that...

 

[toucan]

Thanks for your replies. The chimney doesn't have vermiculite and would be too big a space to fill.