Anyone have any idea what would make cultured split down the middle. I did a chimney and when the home owner went to nail the cap on he said he used 8 pennies and each corner split right down the middle. all the stones all the way down. I've never seen or heard of anything like that and was wonder what some of you thought. I'm going to go take some pics in a few days when I've got some time and I will post them.