Blocking or filling pre cast gas fire flue

[bigdrew]

Possibly a bit of an unusual question but the party wall in my semi has a pre cast gas fire flue built in. I have no intention or re-instating the gas fire.

The joining property also has a flue directly opposite. This doesn't leave much solid material between the houses and it seems to be a real week spot for noise to pass though. (tv noise mainly!)

I would like to make the room a little more sound proof. Is there anyway to fill it in? stuffed full of rockwool / or sand or knocked the flue blocks out and replaced with solid

I have read not leaving them properly vented can cause damp issues so want to be a bit careful with what I try. It finishes with a 5" asbestos pipe in the loft so don't want to disturb that if possible.

Any
recommendations?

 

[Nige F]

If you want to completely fill it with anything you would need to have the asbestos/cement pipe removed and pour in from there. Being a purpose made gas flue it has a much smaller volume than a conventional flue. Or just fill the accesable area from the front with acoustic wool. How did you get on with your floor.

 

[bigdrew]

Thanks Nige, I think I'll stuff some acoustic wool up it and seal both ends. Read a lot of damp horror stories but assuming these are from chimneys which have had a real fire in?

Well remembered - Floor is sorted (after a lot of procrastinating.) It was no where near as daunting as I'd imagined once I'd got going. Its a semi and I intended to carpet all but the kitchen for noise purposes so I didn't put the underfloor heating in.