Inverted Roof Membrane Assembly (IRMA) concrete roof, insulated externally with a moisture resistant high compressive strength XPS insulation that serves to protect the membrane from UV exposure and maintains the roof slab at a stable temperature. The insulation is weighted down by a stone ballast loaded above a drainage layer with integrated geotextile to manage rainwater above the insulation layer.
ProctorGeo DC20 Plus is a dimpled HDPE sheet pre-bonded to a 100gsm non-woven geotextile preventing soil particles from blocking drainage.
Drainage sheet shall be ProctorGeo DC20 Plus secured in accordance with the product user guide. Compression Resistance: 150 kPa, Geotextile weight: 100 g/m², Horizontal drainage flow capacity 2.5 l/m.s.
DCT GA 300 is a closed cell high compressive strength, low moisture absorption extruded polystyrene (XPS) general application board for insulating roofs, walls and floors in commercial and residential applications
The insulation shall be DCT XPS GA300 [ …mm] Extruded Polystyrene (XPS) foam panel with minimum compressive strength (min) 300 kPa (AS 2498.3 = 350 kPa average) and water absorption: < 0.3%. DCT XPS GA300 Extruded Polystyrene (XPS) is manufactured under licence for DCTech.