Over the last 100 years, housing production has seen offsite manufacturing come and go in many guises, from concrete sandwich panels, to steel truss boxes， to double plastic shells. A system is developed that appears to provide cheaper housing production; then there is some sort of failure, actual or perceived -such as damp and fire safety issues highlighted in a notorious 1983 World in Action TV documentary, which caused the timber-frame housing market to crash -and the system is discredited.
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