Anyone got experience of working on these? I'm advising a relative who's
thinking of buying a 1988 Omar Ranch Style home for all year residence.
I've done all the Googling about the pros and cons of the basic idea,
but I don't know anything about the construction, and what the specs are
likely to have been at that time as regards insulation etc. Do they have
timber rafters and joists between which celotex could be fixed? I'm
thinking exterior insulation panels might be prohibitively expensive,
and probably not as effective.

Any advice welcome