We are building a new house. We have a corner fireplace that has thin brick. There is a crack the whole way across the fireplace right the different directions of brick are. We brought it to the attention of our builder and were told that that is something that is very common with that and bricks and even if we go back in and fix it it will happen again. He mentioned that cracks also occur when stone is used but because the stone is close together you cannot see the cracks. What should we do? Here’s a photo of the fireplace as well as a closer photo of the crack.