Finishing internal granite walls

[thomo5949]

i've been renovating a 160 year old granite cottage and have removed the render from some of the internal walls as it was very soft and in poor condition.

I have removed all the internal lathe & plaster walls / ceilings and will be replacing with studwork, plaster board and skimmed. I will be insulating the internal walls.

On the exposed granite wall I have a large gable end chimney breast that I would like to clean up and use as a feature wall, either just repointing or plastering just to leave some of the quoins. From the internal face of the chimney brest to the external wall is approximately 7 foot. Will I need to use lime based product for finishing? If part or the wall is within a bathroom will this cause me problems because it is in a high moisture room?

On the other external walls I was thinking of battening out the walls, insulating the void and fixing plaster board that will be plastered. Will I experience any moisture problems behind the plaster board? Do I need to install vapor barrier? Should I use a product that will ensure the wall can still breath?

Just need some advice so I can move on without making some expensive mistakes.

 

[merlin50]

so your going to cover the nice walls with plasterboard

 

[thomo5949]

so your going to cover the nice walls with plasterboard

Well I was thinking about it, from a comfort point of view. However I see you point about covering up the nice walls. What would you suggest?

 

[merlin50]

mine are cob and are uneven so i have just used a thin layer of plaster applyed with a large paint brush. it holds it all together as it was falling apart in places. i did line one wall a while back but it just caused a damp problem