It is now nine months since our old damp cellar was drained with a retrofitted horizontal barrier – time to take stock. In a building over 100 years old like ours, which was built without the foundation waterproofing that is common today, moisture in the basement is a real challenge. As the rising damp in our cellar became increasingly visible, I installed a new horizontal barrier with injection cream in the thick cellar walls to create a barrier against the ground moisture. In this article, I show in detail what effect the moisture barrier has had, where problems still exist and what other measures seem sensible to keep the cellar…