I want to install a wood burning stove in our house. I. As I have no existing fireplace I have to start from scratch including a false chimney breast to hide the flue etc. An added complication is that our house is upside down (the lounge is on the first floor) and so I need to think about floor loading. I have read through the building standards (scotland) but I'm finding it difficult to understand what is required by way of the "firebox". It appears that I can have a 12 mm thick hearth if I carefully select the appliance and that the walls (plasterboard) need to be either at least 150 mm away or be made of 75mm non combustible material (which I'm assuming means pyrok) if between 50mm & 150mm. Nowhere can I find a mention of heat protection above the fire or the minimum safe distance for combustible materials although I have seen 300mm mentioned elsewhere on this site.