Sisalation to external walls of house.
Ceiling and Wall thermal performance insulation to comply
with 6 Star Energy requirements.
so is that this thermal stuff you speak about?
I'd ask them to clarify what they will do to meet the standards.
The product I'm thinking of was designed to be placed between the truss and the top plate to ensure the wall did not get cold from the truss - or hot. But I can't refind the link.
And another prouduct that you might like to be aware of is noted below.
Hope it helps