On Tue, 16 Oct 2007 17:16:59 -0500, Jim wrote:

"Mary Fisher" wrote
In January 1993 we paid something over £300 for cavity wall insulation,

I am not familiar with this term. In the US, I have always used
paper-faced rolls of fiberglass stapeled between the wall studs. What is
CWI? The same? Sprayed foam/cellulose?

It's applicable to walls constructed of two skins of masonry (bricks or
blocks) with an air gap between them. When retrofitted, holes are drilled
in one skin (usually the outer) and fibrous or granular insulating material
blown into the gap. In USAnia I think you generally have timber-frame and
other constructions where this wouldn't work.

--
John Stumbles