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5U 125 Polyester

125 underlay is intended for use in bituminous
built-up roofing systems. Can be used with any underslating materials, including breather membranes, any tile or slate finishes and in cold or warm roof configurations.

  • Polyester based underlay coated with bitumen and surfaced with fine sand.
  • 125 Underlay conforms to BS747 type 5U.
  • 125 Underlay will ensure long term performance of the underslating, preventing water from running behind the gutter, rotting timber fascias and rafter ends
  • British Standard 747, Type 5U
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