In article , nog
writes
On Mon, 14 Mar 2005 09:32:42 GMT, fred wrote:

IMO, avoid foil based insulation systems, other types (foam based, celotex
etc) are more likely to achieve the claimed insulation performance over the
life of the property.

Wouldn't a foil component (IOW not relying totally on the foil) improve the
effectiveness of a thin insulating medium?

'Fraid not, certainly not if in contact with other materials. Foil is an effective
vapour barrier but achieves heat blocking by inhibiting radiation only. If it is
in contact with any material (insulator or otherwise) the heat loss is by
conduction and not radiation so there is no benefit.
--
fred