Quote Originally Posted by George View Post
Those walls will stay true for a very good number years but in the case of just walls they have no load bearing to make them move out of true.

Its a different kettle of fish when theres a load bearing imposed on same brick and mortar structure,for instance the old 120/130 year old 2 up 2 down houses,some of these house walls moved so badly ove the years that they bellied out and eventually just collapsed,its quite common as many back house walls at the back of where I'm living have gone that way and had to be rebuilt when I look out my back window I see 3 new extensions that have been built at sometime or other and even my own is slightly bellying out when I look at the house wall sideways.

I've even seen frontages of old house's completely fallen out using the brick& mortar of the Victorian age.

Load bearing plays a part in whether a high wall will withstand the test of time.
Just thinking about the walls you often see,on old pic's of tenement houses!These seem to be unusually high,blocking out most daylight,but seem to be built using the same technique i.e. very high,with no buttressing,and a single coarse of brick.but what do I know???