It is also protected from damage by traffic on the roof such as people walking the movement of equipment and so on.
Inverted roof deck insulation.
An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation.
Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure.
Invented by dow in the late 1960 s an inverted roof system uses dupont styrofoam brand xps insulation to protect the membrane helping improve the performance and longevity of the entire roof system.
Armstrong world industries inc.
Three in one composite roof deck panels provide acoustics insulation and a nailable surface that accepts a wide variety of roofing materials.
The great benefit of inverted roofs is that the insulation protects the membrane from extremes of weather such as frost uv exposure and the expansion and contraction that comes about from summer winter temperature cycles which can be as much as 80 c on some roofs.
This makes it the only material suitable and approved for inverted roof applications.