What era did 2'; cavity wallsbecome common in the house building trade?

cavity wall constuction was introduced to the uk during the 19th century and gained wide spread use during the 1920's my house was built in 1929 and it has approx. 2'; cavity walls.


the size of the cavity has largely increased over recent years to enable greater depths of cavity wall insulation to be used...minimum cavity insulation used now is 100mm.





marks answers are strange but then if he worked on houses built in the 20'-30's he must be the oldest computer user i have heard of.. he must be about 90.....What era did 2'; cavity wallsbecome common in the house building trade?
Cavity walls go back to Greek and Roman times and were known in Britain in 1805 with a description being published in 1821. They were becoming quite common by 1850 when metal wall ties across the cavities were introduced. I lived in a house built by Wates in 1931 with standard 2'; cavity walls. Much wider insulated cavities are now in common use to provide good insulating properties. The U value of a traditional uninsulated cavity wall is around 1.4, whereas U values of 0.2 are now common.What era did 2'; cavity wallsbecome common in the house building trade?
During the 1940,s


All the houses from the 1930,s I have worked on are 9 inch solid.


from about the 1940,s houses tend to be 2 inch cavity.


Houses being built today I have worked on are now 4 inch cavity with 2 inches of insulation and 2 inches of air gap.


I would therefore say that the War was the dividing line. [roughly]
the building regs changed in about 1935 to cavity wall constriction. before that a rat trap bond with snap ed header bricks were also used .this formed a partail cavity
I worked on some houses built lates 20 early 30 and they had a 50mm / 2'; cavity.





To clarify then. I was involved in structural repairs and refurbishment of the Boswell houses built in the 20's.





http://sw-norrisgreen.co.uk/decline.htm
Dont think they have, not 2 inch anyway, 10cm at least