Hi All, I've noticed a crack in the harling (roughcasting) at the front of our house and a small patch has actually come away. Although we've been in this house for 18 years, I only recently noticed that there is a huge bead of silicone at either side of the harling on our mid-terrace home. Our harling is different to the others housew in our row (looks like it was re-done). Going to start looking very unsightly, but I am more concerned as to why this has happened. Any ideas? I'm hoping thermal and nothing structural. Thanks in advance for any replies.