The new owners of this double brick end terrace were a little shocked to discover a huge crack running the full height of their Red Fern home. Cause If you look a little closer at the picture above, you will notice that the wall crack has been filled with a silicone based filler. Upon closer inspection Buildfix noticed that different filler had been used over a number of years. This suggest that the hadn't moved much over a long period of time and historical movement is the likely cause. However, what may not be so obvious in the picture above is the bow in the wall. A bowing wall could have many contributing factors such as, material decay or expansion but in this case the untreated crack p