I've recently had built a sectional concrete shed, replacing an old cheap wooden one that after years of neglect destroyed everything that I'd stored in there. The original plan was for a workshop/office, since the Mrs is taking a dim view of me building control panels on the kitchen table. A couple of weeks after the shed was erected, I was still seeing concerning levels of sweating and condensation on the sectional walls, and after the first few searches of horror stories of damp and metal rusting, I knew I needed to do something. From the posts here and elsewhere, I've managed to gather enough information to put together a plan to line the shed correctly, which I'm currently implementing. Since this forum was such a help, I'll post here what I've found and what I've done, In case this information is useful to someone else in a similar position. Firstly, the fixing brackets. As you probably know, its not recommended to drill into the concrete panels. (no, I didn't know either till I started to research online). The shed companies will sell you fixing brackets at an extortionate price, but I re-tasked some galvanized jointing plates (35x97mm), drilling a new 7.5mm hole for the roofing bolts that hold the panels together, 20mm from the edge. Bending the plate to match the angle between the angled edge of the concrete panel and the baton. As per the picture.