A
Anonymous
Guest
I'm no expert but am re-fitting a cast iron fireplace at the moment so have read up on it and asked loads of people. From what I've heard it's there should be a gap between the insert and the surround to allow for expansion and so that the hot metal does not burn the wood, the gap should be around 1/4 inch all the way round, if the gap is larger a thin strip of wood can be applied as mentioned in the previous post.
Nick
Nick