Protan Inverted Roofing Systems
Membrane under the insulation
The membrane, insulation and ballast are installed on top of the load-bearing structure. To minimise cold bridging and foreign bodies penetrating the layer of insulation and then the membrane, the insulation boards are installed using tongue and groove or in two staggered layers. A separation layer is laid on top of the insulation before the ballast to provide protection. A migration barrier has to be used to prevent contact between the insulation and membrane. The insulation boards are ballasted so as to withstand wind forces and any uplift.