legin wrote:

Having read many an interesting discussion within the group, thought
that I would tap the resources.
Assuming that wall is principly constructed using the same materials,
i.e. the u value would be the same.
Would it make amy difference where the insulation was.
Surpose outer brick, cavity, inner block then insulated, boarded and
skimmed as against outer brick, insulated cavity, inner block, boarded
and skimmed.
The u values would be the same but I would have thought that the
initial warm up time would be less as the blockwork mass would have to
be heated to get to the insulation in one of the examples.

Nigel


I think you have it in one.

The better the insulation, and the bigger the thermal mass inside the
insulation, the less it makes sense to have a timed heating system.

I keep imagining those mediaeavel castles with 9ft thick stone walls,
and how long it must have taken to get them up to working temperatures,....