Thermal Insulation ~ this is required within the roof of all dwellings
in the UK. It is necessary to create a comfortable internal
environment, to reduce the risk of condensation and to economise
in fuel consumption costs.
To satisfy these objectives, insulation may be placed between and
over the ceiling joists as shown below to produce acold roofvoid.
Alternatively, the insulation can be located above the rafters as
shown on page 435. Insulation above the rafters creates awarm
roof void and space within the roof structure that may be useful
for habitable accommodation.
Thermal Insulation, Dwelling Roof Space