"Dave Stanton" wrote in message
news
On Fri, 20 Aug 2004 23:26:11 +0100, IMM wrote:


"Rick Dipper" wrote in message
...

More is always better.

Surely the rule of diminishing returns applies here.

Dave



Precisely, and at a certain point negative returns are achieved.

In other words, when the last x mm of insulation takes more energy to
manufacture, distribute, install, and eventually dispose of than it will
ever save over it's expected lifetime, then it has a negative overall
environmental impact.

This cutoff point will also be influenced by the average weather conditions
of the locality. Those advocating movement towards insulation standards
common in Germany, Scandinavia and parts of the North American continent
should remember that they suffer much colder winters than the majority of
the UK which will therefore push the environmental equilibrium towards
installation of more insulation.

--
Richard Sampson

email me at
richard at olifant d-ot co do-t uk