And accuracy (of plastering) had not improved much by 1976, when
my house was built.

The only thing the plasterers had developed to a fine art was
applying a wafer-thin coat of gypsum plaster over the sand and
cement base coat. The latter was also weaker than normal so that
any sort of remedial work breaks through the gypsum top coat and
the base coat disintegrates into sand and fine dust.

Andrew

On 28/07/2019 20:58, Brian Gaff wrote:
Ah economy of plastering brings bumpy finish. Having said that most of the
walls in this 1930s terrace are wobbly tilted, bumpy or curved near corners.
I don't think accuracy was strived for at the time in 1939.
Brian