Following on from the post concerning insulating a concrete floor - I have an building that was the Blacksmiths Shop in my smallholding. Having had to renew the cladding at the ends of the building I have discovered that it used to be a wooden shed on a concrete base but blocks walls have been built inside all the way around giving solid walls and the two side walls have been built externally with block leaving just the ends as wood frame and waney board. That's the background - the issue is that it has rising damp through the concrete floors and up the plastered internal walls and, apart from knocking down and rebuilding with damp courses etc I can't see how to try to insulate the internal space from the damp. Would lining it with a water resistant material or sealing and painting it help? Any ideas gratefully received but with the usual proviso ... it's got to be 'affordable' (read 'cheap' for 'affordable'!). It's got 3 rooms, the largest is approx 4m x 4m, the second 2m x 3.5m and the third 1.5m x 2.5m so it's not too small and it's the largest room that gets the most damp.