bridge. In terms of moisture build-up it was verified that none of
the solutions were problematic.
To optimise the PRM system to the Portuguese building stock,
a cost–benefit analysis of the insulation thickness was carried out.
It was concluded that the thickness that leads to a smaller payback
period (6.9 years) with the best return rate ofthe investmentis that
with 12 cm of XPS and 5 cm of ABC, a U-value of 0.23W/m2 K and a
cost of application of 46.9 D/m2.
Through the extensive measurement campaign performed
on the PRM prototypes, it was possible to observe that