Render is a water-proofing cement coat for the outside, often applied as 2 coats. Inside we use plaster (as I think those of you in wooden houses do too), again two coats, or, quicker, plasterboard and a top skim coat; except in very old buildings which are supposed to breathe, and therefore need limewash as per ManueB's house and a permeable coating, if any, on the outside.I had to look up rendering walls (not a term I’m familiar with) and now I’m curious if the inside of the walls are rendered or not.
Ideally one builds on solid ground and/or puts in decent foundations so that the building doesn't move! But it doesn't always work everywhere, here for example. We're on clay, which notoriously swells and shrinks with water or drought; the plaster inside cracks along a well worn line in one corner of one room up and one down that get filled with filler when we redecorate those rooms but are otherwise ignored and bother no-one here. The render doesn't crack; either the cement is very strong or it has a good plasticizer in it.Considering how much the ground shifts, how is rendering a good idea? It seems like you’d be constantly patching cracks.