On 2 Mar 2006 04:24:15 -0800, "RatRibs73" wrote:

Cheers,

Whats ply membrane, celotex and AI tape. Time may be a problem with
this solution. Plasterer is coming round Thursday.

Is the cost of doing this worth it?

With energy costs up 70% in the last year, I say yes.
50mm Celotex will give terrific insulation. Maybe explain the
situation to the plasterer, he may well have come accross this problem
before.