We're in a Victorian terrace, which originally had fireplaces in the front and back rooms downstairs. The back one was bricked up and plastered/decorated over a long time ago, but the one in the front room was kept as an open fire until we had a gas one installed a couple of years ago.
Now SWMBO has decided that the fireplace in the back room should be opened up as a cavity space, for displaying flowers, etc, or even just for extra storage.
How would I go about doing this? Is it a big job? I presume there must be some problems with the potential for gas to make its way up the chimney breast of the front room and down into the back room. How would I seal the cavity up?
Thanks in advance.
Tom.