ASTROFLEX 4000 SUPRA is a waterproofing membrane made of distilled bitumen modified with SBS (styrene-butadiene-styrene) polymers. The high-grade elastomeric compound ensures great elasticity, ease of application and superior bonding and tightness of all joints and overlaps.
40% of the upper face is coated in relief with THERMOADHESIVE STRIPS made of a special “hot melt” bituminous compound of elastomers and tackifying resins. The strips, when activated by light torching, form a homogeneous adhesive substrate for the simple application of insulation panels without the use of oxidised bitumen, mechanical fixations, mastics or any other kind of adhesives. Side and head overlaps of Vapour Control Layer should be sealed by means of normal torching
The composite roofing system including ASTROFLEX 4000 SUPRA as an underlay and ASTROFLEX 5000 SUPRA as top layer has been tested and classified in category “EXT. F.AA”, in accordance with British Standard BS 476 Part 3:2004 “External Fire Exposure Roof Tests” (Report n°336035).