I'm going to fit a woodburner and have had an installer round to quote for the job. The fireplace is opened up, and is stripped back to the bare, but sooty, stone and bricks. The installer reckons the best finish on them would be render. I have done rendering in the past but always outside in garden/garage walls etc, never in this situation. I thus have several questions....
What sort of preparation should be done on sooty bricks and stone before rendering?
The back of the fireplace is very uneven where it has been hacked away to fit other fires over the years - for example there is a large indent that is 2 inches below the original level - I guess I should fill this first and then render over it?
What technique should I use? - several thin coats or one thick one?
What strength mix should I use?
Answers to any or all of these questions will be greatly appreciated. Alternatively, is there something other than render I could use, e.g. a heat resistant plasterboard?
Mike