Hello
I have an old (ugly) chimney with several flues. The chimney has one side facing the kitchen and another side in the living room. I want to close off the side in the kitchen, put an OSB board, and then plasterboard over it. There used to be a wood stove there, but it hasn't been used for several years because the flue has been used for something else. So right now there's a big hole from the recently removed wood stove that I intend to brick up.
The side in the living room has a stove that is used, which also has a spiral pipe in the flue that goes quite a way up into the attic, but not all the way out. If that's relevant.
Another flue is for the kitchen fan.
To begin with:
1) Are you allowed to build it in? There isn't a cleaning hatch or anything like that.
2) If it is built in, does there need to be a specific distance from flammable materials? There never was anything like that before, as wood has been in direct contact with the construction before.
3) Should anything be considered from a moisture perspective? Insulation? Plastic? Distance between the chimney and the board? Is there a risk of condensation between the board and the chimney?
I believe it should absolutely be okay to enclose it. Two sides are still exposed, the side towards the living room that is used, and a side on the gable.
The flue that is used is on the living room side and not the kitchen side, so there are at least two layers of stone in between. Plus, as mentioned, the stove also has a spiral pipe inside its existing flue. So the chimney doesn't even get warm.
Thanks for the tips.