WHAT IS THE ROOF STRUCTURE LIKE ON A PREFA ALUMINIUM ROOF?
We recommend that you construct PREFA aluminium roofs with a ventilated substructure. The roof covering and thermal insulation layers are separated by a ventilated gap. The advantage of this is that occasional moisture is wicked away. In principle, the roof covering is ventilated (see Figure 1). However, the entire attic can be ventilated too (see Figure 2).