PROMINENT

PROMINENT is the vapour barrier membrane designed by INDEX to resolve the problem of waterproofing where insulation panels must be bonded without using molten oxidised bitumen or cold adhesives or mechanical fastening. The knobs of the embossed top face (>1 300 knobs/m”) of the PROMINENT membrane contain glue. This glue is a special hot-melt thermoplastic ad- hesive which melts quickly when torched and forms a strong bond with the insulation panels pressed onto the membrane. With PROMINENT there will be no
more time wasted waiting for cold bond adhesives to set or risks of burns when installing molten bitumen, along with a significant reduction in waste and pollution, and long setting times of cold glues.

The top face of a normal vapour barrier mem- brane has a layer of bitumen covering the reinforcement which is no more than 1+1.5 mm thick, while the embossed parts of the PROMI- NENT membrane protrude by 3+3.5 mm (about 2.5 mm for the 3 kg/m2 type) like an adhesive applied with a toothed spatula. Once the flame has softened the adhesive it is easier to flatten the insulating panel with better results, because
with a greater thickness to work with, it is easier to level off the prominent zones with the torch, making up for any unevenness in the substrate. PROMINENT has two longitudinal overlapping strips which, when overlapped, form almost the same thickness between the embossed part and the overlap, therefore avoiding the “up and down” effect of panels installed on the overlaps. The
high softening point of the embossed part of the PROMINENT membranes is over 140°C, higher than that of the oxidised bitumens nor- mally used for bonding insulating panels, along with the high adhesive surface area which can be obtained (around 40%), ensure reliable in- stallation on any slope. With PROMINENT you don’t need other materials, because you get an adhesive and a
vapour barrier in one single product.
PROMINENT ALU POLYESTER is a membrane with high resistance to the diffusion of water vapour, reinforced with composite non-
woven polyester fabric stabilised with fibre glass, combined with a 60 micron aluminium foil: a total vapour barrier.