We live in a victorian / edwardian terraced house in Cornwall which has
solid granite "cob" walls, a number of which suffer from penetrating damp. A
builder has told us that we may need to have them tanked but it appears that
this is a "trade only" product. Can anyone tell me what it is, how it is
appplied and what the Retail name is. Do Screwfix or e.g. B&Q sell it?
Thanks.