Insulating sloped wall/ceiling interface

sami2015

Hi All,
I have just purchased a new house and it needs to be fully insulated.... I had an insulation company call out to advise and they suggested using internal insulated plaster slabs on the front of the house (which has brickwork) and external insulation at the rear and sides (Which has particularly small rooms). I have 2 main queries regarding the internal insulation:

1) The upstairs rooms extend into the "roof space", in the sense that the perimeter walls slope inwards and I am wondering if the insulation should follow the profile of the wall? Does anyone have any figures showing details of how it should be fitted?

2) Is it common to insulate the walls between joists supporting the first floor? How do people typically accomplish this?

Thanks in advance,
sami

corkthai

Interested in this also, have a similar situation.
A spray foam insulation in the attic was suggested to me but not sure how that would work with ventilation etc,