BituFlex FR


High Performance Fire Retardant SBS Modified Bitumen Waterproofing Membrane With Composite Polyester Reinforcement

BITUFLEX FR Mineral is a selfprotected elastomeric waterproofing membrane, manufactured in an advanced continuous calendaring process by saturating and coating a composite carrier with a waterproofing compound made of a special grade of bitumen, modified with SBS polymers and special FIRE RETARDING chemical additives.

While the SBS polymers enhance the thermal, mechanical, and aging properties of the membrane compound, the mechanical characteristics of BITUFLEX FR Mineral are established by the composite carrier made of nonwoven Polyester armoured with Glassfiber filaments, which acts as the reinforcement that provides the membrane with the profound mechanical properties of the Polyester and the prominent dimensional stability of Glassfiber mats.

The upper surfaces of BITUFLEX FR Mineral is covered with colored mineral slate chips, with an 8cm slate free side margin for overlap welding, whereas the lower surface is laminated with a thermo-fusible polyethylene film.


BITUFLEX FR Mineral can be used for special roofing and waterproofing applications with fire-retarding property requirements & subjected to excessive mechanical stresses, movement, and critical weathering conditions.

BITUFLEX FR Mineral is used as a single layer or as a top layer in an exposed multi layer roofing system for the following roofing applications:

  • Exposed roofing in civil, industrial, and military works.
  • Exposed re-roofing jobs on compatible substrates.
  • Under roofing clay tiles on pitched roofs where tiles are fixed with mortar.
  • Flashings for exposed up-stands in SBS modified bitumen roofing systems.

Spec Sheet


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