? Where you've broken out the inner skin of brickwork it looks like there is no cavity & the external skin is black from a fire, and would only be a half-brick thick to the outside. Not that unusual for the period but what about the rest of the huge wall? - check using the external brickwork bond pattern if there are two skins and actually are connected, don't think they used brick ties in the 1920's (?).Right. So I’ve taken the cement/plaster off the chimney breast.
There was a back boiler in the space, which has been removed.
I’ve taken a brick out to the left and right of where the boiler used to be to add ventilation to the entire chimney.
I have also taken out some bricks at the front of the chimney (floor level) as there is a load of crap each side, which I intend to clean out to avoid any further issues and also aid ventilation.
As mentioned this is going to be a kitchen so I will box off main opening and install vents to maintain circulation.
They will be hidden behind the kitchen carcasses anyway.
How should I finish the chimney breast, sand/cement?
I’ve never used lime before but thinking that might be better.
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Yes, that's the main reason for it's height, and/or possible debris build-up, but if rising damp does not happen why bother with a DPC. If you refer back to your copy of Vetruvius book 7 on stucco ;-when water falls (ie off a soffit) when it hits the ground it splashes and normally it never splashes higher than 100mm...
thats my understanding for DPC