All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent persons should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.
My best advice is that you should retain a competent building professional to advise you on these matters.
There is also some guidance in this regard in the relevant sections of TGD L, link as follows:
http://www.environ.ie/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad,19069,en.pdf
For those who wish to play around with the u-values of different wall or roof build-ups theres a free and not overly-complicated calculator available at: [broken link removed]