If you have a wood-burning or multifuel stove you will no doubt have come across the term firebrick. You will probably have bought one, maybe even installed one yourself but what is the actual purpose of a firebrick? What do they do? Do they need replaced? What are the signs of wear and tear?
Protection and added heat
The key to the performance of firebricks is the fact that even under the most intense heat the outer surface always remains cool. If you take a look at your stove you will see that the firebricks are used to line the inner area of the firebox which is traditionally made of steel or cast iron. This prompts the question, if the firebox is made of such tough metal then why does it require the protection of firebricks?