Hi, I've got a 5kW wood burner in my lounge and I'm gonna put some brick slips on the inside of the fireplace. As its only a small area and I'm using "rustic" slips, I'm gonna do it myself. My questions are: Do I need any special heat resistant adhesive? For the grouting, can I just use mortar? It is there a special mortar looking grout I have to use? Thanks.